31522493 has 2 divisors, whose sum is σ = 31522494. Its totient is φ = 31522492.

The previous prime is 31522459. The next prime is 31522523. The reversal of 31522493 is 39422513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29019769 + 2502724 = 5387^2 + 1582^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31522493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31522433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15761246 + 15761247.

It is an arithmetic number, because the mean of its divisors is an integer number (15761247).

Almost surely, 2^31522493 is an apocalyptic number.

It is an amenable number.

31522493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31522493 is an equidigital number, since it uses as much as digits as its factorization.

31522493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 29.

The square root of 31522493 is about 5614.4895582769. The cubic root of 31522493 is about 315.8931333607.

The spelling of 31522493 in words is "thirty-one million, five hundred twenty-two thousand, four hundred ninety-three".