31457232013 has 2 divisors, whose sum is σ = 31457232014. Its totient is φ = 31457232012.

The previous prime is 31457232011. The next prime is 31457232019. The reversal of 31457232013 is 31023275413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29689702249 + 1767529764 = 172307^2 + 42042^2 .

It is a cyclic number.

It is not a de Polignac number, because 31457232013 - 2¹ = 31457232011 is a prime.

Together with 31457232011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31457232011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15728616006 + 15728616007.

It is an arithmetic number, because the mean of its divisors is an integer number (15728616007).

Almost surely, 2^31457232013 is an apocalyptic number.

It is an amenable number.

31457232013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31457232013 is an equidigital number, since it uses as much as digits as its factorization.

31457232013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 31.

The spelling of 31457232013 in words is "thirty-one billion, four hundred fifty-seven million, two hundred thirty-two thousand, thirteen".