13231639637 has 2 divisors, whose sum is σ = 13231639638. Its totient is φ = 13231639636.

The previous prime is 13231639627. The next prime is 13231639711. The reversal of 13231639637 is 73693613231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8344091716 + 4887547921 = 91346^2 + 69911^2 .

It is a cyclic number.

It is not a de Polignac number, because 13231639637 - 2¹⁸ = 13231377493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13231639627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6615819818 + 6615819819.

It is an arithmetic number, because the mean of its divisors is an integer number (6615819819).

Almost surely, 2^13231639637 is an apocalyptic number.

It is an amenable number.

13231639637 is a deficient number, since it is larger than the sum of its proper divisors (1).

13231639637 is an equidigital number, since it uses as much as digits as its factorization.

13231639637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 44.

The spelling of 13231639637 in words is "thirteen billion, two hundred thirty-one million, six hundred thirty-nine thousand, six hundred thirty-seven".