12555931 has 2 divisors, whose sum is σ = 12555932. Its totient is φ = 12555930.

The previous prime is 12555863. The next prime is 12555947. The reversal of 12555931 is 13955521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12555931 is a prime.

It is a super-2 number, since 2×12555931² = 315302806553522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12555893 and 12555902.

It is not a weakly prime, because it can be changed into another prime (12550931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6277965 + 6277966.

It is an arithmetic number, because the mean of its divisors is an integer number (6277966).

Almost surely, 2^12555931 is an apocalyptic number.

12555931 is a deficient number, since it is larger than the sum of its proper divisors (1).

12555931 is an equidigital number, since it uses as much as digits as its factorization.

12555931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6750, while the sum is 31.

The square root of 12555931 is about 3543.4349154457. The cubic root of 12555931 is about 232.4250716274.

The spelling of 12555931 in words is "twelve million, five hundred fifty-five thousand, nine hundred thirty-one".