1312631 has 4 divisors (see below), whose sum is σ = 1319064. Its totient is φ = 1306200.

The previous prime is 1312603. The next prime is 1312637. The reversal of 1312631 is 1362131.

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 1312631 - 2⁶ = 1312567 is a prime.

It is a super-2 number, since 2×1312631² = 3446000284322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2900 + ... + 3321.

It is an arithmetic number, because the mean of its divisors is an integer number (329766).

2^1312631 is an apocalyptic number.

1312631 is a deficient number, since it is larger than the sum of its proper divisors (6433).

1312631 is an equidigital number, since it uses as much as digits as its factorization.

1312631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6432.

The product of its digits is 108, while the sum is 17.

The square root of 1312631 is about 1145.7010953997. The cubic root of 1312631 is about 109.4916210237.

Adding to 1312631 its reverse (1362131), we get a palindrome (2674762).

The spelling of 1312631 in words is "one million, three hundred twelve thousand, six hundred thirty-one".