31090979 has 4 divisors (see below), whose sum is σ = 31139976. Its totient is φ = 31041984.

The previous prime is 31090967. The next prime is 31090991. The reversal of 31090979 is 97909013.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (31090967) and next prime (31090991).

It is a cyclic number.

It is not a de Polignac number, because 31090979 - 2⁸ = 31090723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31090999) 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 in 3 ways as a sum of consecutive naturals, for example, 23534 + ... + 24819.

It is an arithmetic number, because the mean of its divisors is an integer number (7784994).

Almost surely, 2^31090979 is an apocalyptic number.

31090979 is a deficient number, since it is larger than the sum of its proper divisors (48997).

31090979 is an equidigital number, since it uses as much as digits as its factorization.

31090979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48996.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 31090979 is about 5575.9285325406. The cubic root of 31090979 is about 314.4450765686.

The spelling of 31090979 in words is "thirty-one million, ninety thousand, nine hundred seventy-nine".