31245979 has 2 divisors, whose sum is σ = 31245980. Its totient is φ = 31245978.

The previous prime is 31245967. The next prime is 31245997. The reversal of 31245979 is 97954213.

Together with next prime (31245997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31245979 - 2⁵ = 31245947 is a prime.

It is a super-2 number, since 2×31245979² = 1952622407336882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31245479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15622989 + 15622990.

It is an arithmetic number, because the mean of its divisors is an integer number (15622990).

Almost surely, 2^31245979 is an apocalyptic number.

31245979 is a deficient number, since it is larger than the sum of its proper divisors (1).

31245979 is an equidigital number, since it uses as much as digits as its factorization.

31245979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 40.

The square root of 31245979 is about 5589.8102830060. The cubic root of 31245979 is about 314.9667521808.

The spelling of 31245979 in words is "thirty-one million, two hundred forty-five thousand, nine hundred seventy-nine".