12920431 has 2 divisors, whose sum is σ = 12920432. Its totient is φ = 12920430.

The previous prime is 12920429. The next prime is 12920443. The reversal of 12920431 is 13402921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12920431 - 2¹ = 12920429 is a prime.

It is a super-2 number, since 2×12920431² = 333875074451522, which contains 22 as substring.

Together with 12920429, it forms a pair of twin primes.

It is a Chen prime.

It is the 3595-th Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12920461) by changing a digit.

It is a nontrivial repunit in base 3594.

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, 6460215 + 6460216.

It is an arithmetic number, because the mean of its divisors is an integer number (6460216).

Almost surely, 2^12920431 is an apocalyptic number.

12920431 is a deficient number, since it is larger than the sum of its proper divisors (1).

12920431 is an equidigital number, since it uses as much as digits as its factorization.

12920431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 12920431 is about 3594.5001043261. The cubic root of 12920431 is about 234.6527601396.

The spelling of 12920431 in words is "twelve million, nine hundred twenty thousand, four hundred thirty-one".