12913157 has 4 divisors (see below), whose sum is σ = 12921216. Its totient is φ = 12905100.

The previous prime is 12913139. The next prime is 12913163. The reversal of 12913157 is 75131921.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12913157 - 2⁸ = 12912901 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 (12913127) 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, 719 + ... + 5132.

It is an arithmetic number, because the mean of its divisors is an integer number (3230304).

Almost surely, 2^12913157 is an apocalyptic number.

It is an amenable number.

12913157 is a deficient number, since it is larger than the sum of its proper divisors (8059).

12913157 is an equidigital number, since it uses as much as digits as its factorization.

12913157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8058.

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

The square root of 12913157 is about 3593.4881382857. The cubic root of 12913157 is about 234.6087165988.

The spelling of 12913157 in words is "twelve million, nine hundred thirteen thousand, one hundred fifty-seven".