31057979 has 2 divisors, whose sum is σ = 31057980. Its totient is φ = 31057978.

The previous prime is 31057973. The next prime is 31058039. The reversal of 31057979 is 97975013.

It is a weak prime.

It is an emirp because it is prime and its reverse (97975013) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31057979 is a prime.

It is not a weakly prime, because it can be changed into another prime (31057973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15528989 + 15528990.

It is an arithmetic number, because the mean of its divisors is an integer number (15528990).

Almost surely, 2^31057979 is an apocalyptic number.

31057979 is a deficient number, since it is larger than the sum of its proper divisors (1).

31057979 is an equidigital number, since it uses as much as digits as its factorization.

31057979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 59535, while the sum is 41.

The square root of 31057979 is about 5572.9685985119. The cubic root of 31057979 is about 314.3337863991. Note that the first 3 decimals are identical.

The spelling of 31057979 in words is "thirty-one million, fifty-seven thousand, nine hundred seventy-nine".