12756431 has 2 divisors, whose sum is σ = 12756432. Its totient is φ = 12756430.

The previous prime is 12756413. The next prime is 12756437. The reversal of 12756431 is 13465721.

Together with previous prime (12756413) 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 a de Polignac number, because none of the positive numbers 2^k-12756431 is a prime.

It is a super-2 number, since 2×12756431² = 325453063715522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12756394 and 12756403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12756437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6378215 + 6378216.

It is an arithmetic number, because the mean of its divisors is an integer number (6378216).

Almost surely, 2^12756431 is an apocalyptic number.

12756431 is a deficient number, since it is larger than the sum of its proper divisors (1).

12756431 is an equidigital number, since it uses as much as digits as its factorization.

12756431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 29.

The square root of 12756431 is about 3571.6146208683. The cubic root of 12756431 is about 233.6557079152.

The spelling of 12756431 in words is "twelve million, seven hundred fifty-six thousand, four hundred thirty-one".