31210040993 has 2 divisors, whose sum is σ = 31210040994. Its totient is φ = 31210040992.

The previous prime is 31210040921. The next prime is 31210041017. The reversal of 31210040993 is 39904001213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21849865489 + 9360175504 = 147817^2 + 96748^2 .

It is a cyclic number.

It is not a de Polignac number, because 31210040993 - 2²⁸ = 30941605537 is a prime.

It is not a weakly prime, because it can be changed into another prime (31210000993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15605020496 + 15605020497.

It is an arithmetic number, because the mean of its divisors is an integer number (15605020497).

Almost surely, 2^31210040993 is an apocalyptic number.

It is an amenable number.

31210040993 is a deficient number, since it is larger than the sum of its proper divisors (1).

31210040993 is an equidigital number, since it uses as much as digits as its factorization.

31210040993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The spelling of 31210040993 in words is "thirty-one billion, two hundred ten million, forty thousand, nine hundred ninety-three".