31312493 has 2 divisors, whose sum is σ = 31312494. Its totient is φ = 31312492.

The previous prime is 31312447. The next prime is 31312507. The reversal of 31312493 is 39421313.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25270729 + 6041764 = 5027^2 + 2458^2 .

It is a cyclic number.

It is not a de Polignac number, because 31312493 - 2²⁰ = 30263917 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31312403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656246 + 15656247.

It is an arithmetic number, because the mean of its divisors is an integer number (15656247).

Almost surely, 2^31312493 is an apocalyptic number.

It is an amenable number.

31312493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31312493 is an equidigital number, since it uses as much as digits as its factorization.

31312493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 26.

The square root of 31312493 is about 5595.7566959259. The cubic root of 31312493 is about 315.1900859923.

The spelling of 31312493 in words is "thirty-one million, three hundred twelve thousand, four hundred ninety-three".