31402020913 has 2 divisors, whose sum is σ = 31402020914. Its totient is φ = 31402020912.

The previous prime is 31402020899. The next prime is 31402020919. The reversal of 31402020913 is 31902020413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30023532529 + 1378488384 = 173273^2 + 37128^2 .

It is a cyclic number.

It is not a de Polignac number, because 31402020913 - 2²¹ = 31399923761 is a prime.

It is not a weakly prime, because it can be changed into another prime (31402020919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15701010456 + 15701010457.

It is an arithmetic number, because the mean of its divisors is an integer number (15701010457).

Almost surely, 2^31402020913 is an apocalyptic number.

It is an amenable number.

31402020913 is a deficient number, since it is larger than the sum of its proper divisors (1).

31402020913 is an equidigital number, since it uses as much as digits as its factorization.

31402020913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The spelling of 31402020913 in words is "thirty-one billion, four hundred two million, twenty thousand, nine hundred thirteen".