12912657 has 4 divisors (see below), whose sum is σ = 17216880. Its totient is φ = 8608436.

The previous prime is 12912649. The next prime is 12912659. The reversal of 12912657 is 75621921.

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: 75621921 = 3 ⋅25207307.

It is a cyclic number.

It is not a de Polignac number, because 12912657 - 2³ = 12912649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12912659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2152107 + ... + 2152112.

It is an arithmetic number, because the mean of its divisors is an integer number (4304220).

Almost surely, 2^12912657 is an apocalyptic number.

It is an amenable number.

12912657 is a deficient number, since it is larger than the sum of its proper divisors (4304223).

12912657 is an equidigital number, since it uses as much as digits as its factorization.

12912657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4304222.

The product of its digits is 7560, while the sum is 33.

The square root of 12912657 is about 3593.4185673255. The cubic root of 12912657 is about 234.6056885277.

The spelling of 12912657 in words is "twelve million, nine hundred twelve thousand, six hundred fifty-seven".