31013993 has 2 divisors, whose sum is σ = 31013994. Its totient is φ = 31013992.

The previous prime is 31013971. The next prime is 31014013. The reversal of 31013993 is 39931013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30162064 + 851929 = 5492^2 + 923^2 .

It is a cyclic number.

It is not a de Polignac number, because 31013993 - 2⁶ = 31013929 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31013953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506996 + 15506997.

It is an arithmetic number, because the mean of its divisors is an integer number (15506997).

Almost surely, 2^31013993 is an apocalyptic number.

It is an amenable number.

31013993 is a deficient number, since it is larger than the sum of its proper divisors (1).

31013993 is an equidigital number, since it uses as much as digits as its factorization.

31013993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2187, while the sum is 29.

The square root of 31013993 is about 5569.0208295534. The cubic root of 31013993 is about 314.1853240856.

The spelling of 31013993 in words is "thirty-one million, thirteen thousand, nine hundred ninety-three".