12556257 has 16 divisors (see below), whose sum is σ = 19189632. Its totient is φ = 7153920.

The previous prime is 12556253. The next prime is 12556261. The reversal of 12556257 is 75265521.

It is an interprime number because it is at equal distance from previous prime (12556253) and next prime (12556261).

It is not a de Polignac number, because 12556257 - 2² = 12556253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12556253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9033 + ... + 10329.

It is an arithmetic number, because the mean of its divisors is an integer number (1199352).

Almost surely, 2^12556257 is an apocalyptic number.

It is an amenable number.

12556257 is a deficient number, since it is larger than the sum of its proper divisors (6633375).

12556257 is a wasteful number, since it uses less digits than its factorization.

12556257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768.

The product of its digits is 21000, while the sum is 33.

The square root of 12556257 is about 3543.4809157099. The cubic root of 12556257 is about 232.4270831580.

The spelling of 12556257 in words is "twelve million, five hundred fifty-six thousand, two hundred fifty-seven".