12565831 has 2 divisors, whose sum is σ = 12565832. Its totient is φ = 12565830.

The previous prime is 12565811. The next prime is 12565837. The reversal of 12565831 is 13856521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12565831 - 2⁵ = 12565799 is a prime.

It is a super-2 number, since 2×12565831² = 315800217441122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12565793 and 12565802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12565837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6282915 + 6282916.

It is an arithmetic number, because the mean of its divisors is an integer number (6282916).

Almost surely, 2^12565831 is an apocalyptic number.

12565831 is a deficient number, since it is larger than the sum of its proper divisors (1).

12565831 is an equidigital number, since it uses as much as digits as its factorization.

12565831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 31.

The square root of 12565831 is about 3544.8315897938. The cubic root of 12565831 is about 232.4861424662.

It can be divided in two parts, 125 and 65831, that added together give a palindrome (65956).

The spelling of 12565831 in words is "twelve million, five hundred sixty-five thousand, eight hundred thirty-one".