12811311631 has 4 divisors (see below), whose sum is σ = 12812036512. Its totient is φ = 12810586752.

The previous prime is 12811311619. The next prime is 12811311637. The reversal of 12811311631 is 13611311821.

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 12811311631 - 2⁵ = 12811311599 is a prime.

It is a super-2 number, since 2×12811311631² (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 12811311631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12811311637) 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, 335250 + ... + 371503.

It is an arithmetic number, because the mean of its divisors is an integer number (3203009128).

Almost surely, 2^12811311631 is an apocalyptic number.

12811311631 is a deficient number, since it is larger than the sum of its proper divisors (724881).

12811311631 is an equidigital number, since it uses as much as digits as its factorization.

12811311631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724880.

The product of its digits is 864, while the sum is 28.

The spelling of 12811311631 in words is "twelve billion, eight hundred eleven million, three hundred eleven thousand, six hundred thirty-one".