1312722631 has 32 divisors (see below), whose sum is σ = 1524096000. Its totient is φ = 1119022080.

The previous prime is 1312722611. The next prime is 1312722637. The reversal of 1312722631 is 1362272131.

It is not a de Polignac number, because 1312722631 - 2⁵ = 1312722599 is a prime.

It is a super-2 number, since 2×1312722631² = 3446481411879124322, which 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 1312722631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312722637) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3656430 + ... + 3656788.

It is an arithmetic number, because the mean of its divisors is an integer number (47628000).

Almost surely, 2^1312722631 is an apocalyptic number.

1312722631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1312722631 is a deficient number, since it is larger than the sum of its proper divisors (211373369).

1312722631 is a wasteful number, since it uses less digits than its factorization.

1312722631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639.

The product of its digits is 3024, while the sum is 28.

The square root of 1312722631 is about 36231.5143348991. The cubic root of 1312722631 is about 1094.9416872959.

Adding to 1312722631 its reverse (1362272131), we get a palindrome (2674994762).

It can be divided in two parts, 131272 and 2631, that added together give a triangular number (133903 = T₅₁₇).

The spelling of 1312722631 in words is "one billion, three hundred twelve million, seven hundred twenty-two thousand, six hundred thirty-one".