31137640213 has 2 divisors, whose sum is σ = 31137640214. Its totient is φ = 31137640212.

The previous prime is 31137640207. The next prime is 31137640243. The reversal of 31137640213 is 31204673113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30283656484 + 853983729 = 174022^2 + 29223^2 .

It is a cyclic number.

It is not a de Polignac number, because 31137640213 - 2²⁵ = 31104085781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31137640243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15568820106 + 15568820107.

It is an arithmetic number, because the mean of its divisors is an integer number (15568820107).

Almost surely, 2^31137640213 is an apocalyptic number.

It is an amenable number.

31137640213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31137640213 is an equidigital number, since it uses as much as digits as its factorization.

31137640213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The spelling of 31137640213 in words is "thirty-one billion, one hundred thirty-seven million, six hundred forty thousand, two hundred thirteen".