12556631 has 2 divisors, whose sum is σ = 12556632. Its totient is φ = 12556630.

The previous prime is 12556613. The next prime is 12556637. The reversal of 12556631 is 13665521.

Together with previous prime (12556613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12556631 - 2¹⁰ = 12555607 is a prime.

It is a super-2 number, since 2×12556631² = 315337964140322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12556594 and 12556603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12556637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6278315 + 6278316.

It is an arithmetic number, because the mean of its divisors is an integer number (6278316).

Almost surely, 2^12556631 is an apocalyptic number.

12556631 is a deficient number, since it is larger than the sum of its proper divisors (1).

12556631 is an equidigital number, since it uses as much as digits as its factorization.

12556631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 29.

The square root of 12556631 is about 3543.5336882835. The cubic root of 12556631 is about 232.4293908219.

The spelling of 12556631 in words is "twelve million, five hundred fifty-six thousand, six hundred thirty-one".