12913657 has 4 divisors (see below), whose sum is σ = 12925440. Its totient is φ = 12901876.

The previous prime is 12913651. The next prime is 12913661. The reversal of 12913657 is 75631921.

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: 75631921 = 41 ⋅1844681.

It is a cyclic number.

It is not a de Polignac number, because 12913657 - 2⁷ = 12913529 is a prime.

It is a super-2 number, since 2×12913657² = 333525074227298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12913651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4057 + ... + 6502.

It is an arithmetic number, because the mean of its divisors is an integer number (3231360).

Almost surely, 2^12913657 is an apocalyptic number.

It is an amenable number.

12913657 is a deficient number, since it is larger than the sum of its proper divisors (11783).

12913657 is a wasteful number, since it uses less digits than its factorization.

12913657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11782.

The product of its digits is 11340, while the sum is 34.

The square root of 12913657 is about 3593.5577078990. The cubic root of 12913657 is about 234.6117445917.

The spelling of 12913657 in words is "twelve million, nine hundred thirteen thousand, six hundred fifty-seven".