31310497 has 2 divisors, whose sum is σ = 31310498. Its totient is φ = 31310496.

The previous prime is 31310491. The next prime is 31310509. The reversal of 31310497 is 79401313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27050401 + 4260096 = 5201^2 + 2064^2 .

It is a cyclic number.

It is not a de Polignac number, because 31310497 - 2⁷ = 31310369 is a prime.

It is equal to p_1933921 and since 31310497 and 1933921 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (31310491) 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, 15655248 + 15655249.

It is an arithmetic number, because the mean of its divisors is an integer number (15655249).

Almost surely, 2^31310497 is an apocalyptic number.

It is an amenable number.

31310497 is a deficient number, since it is larger than the sum of its proper divisors (1).

31310497 is an equidigital number, since it uses as much as digits as its factorization.

31310497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 31310497 is about 5595.5783436567. The cubic root of 31310497 is about 315.1833886358.

The spelling of 31310497 in words is "thirty-one million, three hundred ten thousand, four hundred ninety-seven".