13613031631 has 4 divisors (see below), whose sum is σ = 14329507000. Its totient is φ = 12896556264.

The previous prime is 13613031629. The next prime is 13613031661.

13613031631 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13613031631 - 2¹ = 13613031629 is a prime.

It is a super-2 number, since 2×13613031631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13613031631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13613031611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358237656 + ... + 358237693.

It is an arithmetic number, because the mean of its divisors is an integer number (3582376750).

Almost surely, 2^13613031631 is an apocalyptic number.

13613031631 is a deficient number, since it is larger than the sum of its proper divisors (716475369).

13613031631 is an equidigital number, since it uses as much as digits as its factorization.

13613031631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716475368.

The product of its (nonzero) digits is 2916, while the sum is 28.

It can be divided in two parts, 136130 and 31631, that added together give a palindrome (167761).

The spelling of 13613031631 in words is "thirteen billion, six hundred thirteen million, thirty-one thousand, six hundred thirty-one".