31372493 has 2 divisors, whose sum is σ = 31372494. Its totient is φ = 31372492.

The previous prime is 31372469. The next prime is 31372513. The reversal of 31372493 is 39427313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23990404 + 7382089 = 4898^2 + 2717^2 .

It is a cyclic number.

It is not a de Polignac number, because 31372493 - 2¹² = 31368397 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31375493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15686246 + 15686247.

It is an arithmetic number, because the mean of its divisors is an integer number (15686247).

Almost surely, 2^31372493 is an apocalyptic number.

It is an amenable number.

31372493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31372493 is an equidigital number, since it uses as much as digits as its factorization.

31372493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 32.

The square root of 31372493 is about 5601.1153353596. The cubic root of 31372493 is about 315.3912766039.

The spelling of 31372493 in words is "thirty-one million, three hundred seventy-two thousand, four hundred ninety-three".