MathBabbler's rental car odometer hit 19,991 miles while driving on I-55 near Pontiac, Illinois. [7/4/2016]
MathBabbler Number Analyst (MBNA) output: ========================================= 19991 is natural, counting, whole, integer 19991 is odd (not even) 19991 proper divisors are: 1, 19991 has 1 proper divisors 19991 is deficient (sum of divisors is 1; ratio: 5.00225e-05) 19991 is unhappy 19991 is a Squarefree Number 19991 is prime (not composite) ...Sexy prime with 19997 ...Sexy Quadruple prime with 19979, 19985, 19997 ...Sophie Germain prime with 39983 ...Twin prime with 19993 ...Truman Gerald (p+30) prime with 20021 ...Truman Gerald (p-30) prime with 19961 ...OEIS:002145 (4n+3; n=4997) ...reversible prime prime with 19991 ...Right-truncatable prime ...Eisenstein (3n-1; n=6664) ...Strong prime ...prime triplet {19991, 19993, 19997} 19991 is palindromic 19991 is Arithmetic (A003601) 19991 in octal is 047027 19991 in hexadecimal is 0x4e17 19991 in binary is 100111000010111 (is evil) 19991 nearest square numbers: -110...173 (19881...20164 [142]) sqrt(19991) = 141.39 ln(19991) = 9.90304 log(19991) = 4.30083 19991 reciprocal is .00005002251012955830123555600020 19991 is an apocalyptic power (2^19991 contains 666) 19991! is inf 19991 is 6363.33 Pi years 19991 is 999 score and 11 years 19991 is 9996^2 - 9995^2 and 9996 + 9995 = 19991 19991 is a multiple of 1 & it contains a 1 (A011531)
Creator: Gerald Thurman
[gthurman@gmail.com]
Created: 06 July 2016