12931157 has 4 divisors (see below), whose sum is σ = 13206336. Its totient is φ = 12655980.

The previous prime is 12931133. The next prime is 12931181. The reversal of 12931157 is 75113921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75113921 = 83 ⋅904987.

It is an interprime number because it is at equal distance from previous prime (12931133) and next prime (12931181).

It is a cyclic number.

It is not a de Polignac number, because 12931157 - 2¹⁰ = 12930133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12931757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137519 + ... + 137612.

It is an arithmetic number, because the mean of its divisors is an integer number (3301584).

Almost surely, 2^12931157 is an apocalyptic number.

It is an amenable number.

12931157 is a deficient number, since it is larger than the sum of its proper divisors (275179).

12931157 is an equidigital number, since it uses as much as digits as its factorization.

12931157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275178.

The product of its digits is 1890, while the sum is 29.

The square root of 12931157 is about 3595.9917964311. The cubic root of 12931157 is about 234.7176751401.

The spelling of 12931157 in words is "twelve million, nine hundred thirty-one thousand, one hundred fifty-seven".