12731631 has 16 divisors (see below), whose sum is σ = 18624000. Its totient is φ = 7672320.

The previous prime is 12731629. The next prime is 12731633. The reversal of 12731631 is 13613721.

12731631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12731629) and next prime (12731633).

It is not a de Polignac number, because 12731631 - 2¹ = 12731629 is a prime.

It is a super-2 number, since 2×12731631² = 324188855840322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12731633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5370 + ... + 7368.

It is an arithmetic number, because the mean of its divisors is an integer number (1164000).

Almost surely, 2^12731631 is an apocalyptic number.

12731631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12731631 is a deficient number, since it is larger than the sum of its proper divisors (5892369).

12731631 is a wasteful number, since it uses less digits than its factorization.

12731631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2206.

The product of its digits is 756, while the sum is 24.

The square root of 12731631 is about 3568.1411126804. The cubic root of 12731631 is about 233.5041916385.

The spelling of 12731631 in words is "twelve million, seven hundred thirty-one thousand, six hundred thirty-one".