31495979 has 2 divisors, whose sum is σ = 31495980. Its totient is φ = 31495978.

The previous prime is 31495949. The next prime is 31496011. The reversal of 31495979 is 97959413.

It is a weak prime.

It is an emirp because it is prime and its reverse (97959413) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31495979 - 2²⁴ = 14718763 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (31495949) 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, 15747989 + 15747990.

It is an arithmetic number, because the mean of its divisors is an integer number (15747990).

Almost surely, 2^31495979 is an apocalyptic number.

31495979 is a deficient number, since it is larger than the sum of its proper divisors (1).

31495979 is an equidigital number, since it uses as much as digits as its factorization.

31495979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 47.

The square root of 31495979 is about 5612.1278495772. The cubic root of 31495979 is about 315.8045411724.

The spelling of 31495979 in words is "thirty-one million, four hundred ninety-five thousand, nine hundred seventy-nine".