15191131 has 2 divisors, whose sum is σ = 15191132. Its totient is φ = 15191130.

The previous prime is 15191129. The next prime is 15191159. The reversal of 15191131 is 13119151.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15191131 - 2¹ = 15191129 is a prime.

It is a super-2 number, since 2×15191131² = 461540922118322, which contains 22 as substring.

Together with 15191129, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15191101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7595565 + 7595566.

It is an arithmetic number, because the mean of its divisors is an integer number (7595566).

Almost surely, 2^15191131 is an apocalyptic number.

15191131 is a deficient number, since it is larger than the sum of its proper divisors (1).

15191131 is an equidigital number, since it uses as much as digits as its factorization.

15191131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 135, while the sum is 22.

The square root of 15191131 is about 3897.5801467064. The cubic root of 15191131 is about 247.6642775642.

The spelling of 15191131 in words is "fifteen million, one hundred ninety-one thousand, one hundred thirty-one".