1308631 has 4 divisors (see below), whose sum is σ = 1365552. Its totient is φ = 1251712.

The previous prime is 1308613. The next prime is 1308647. The reversal of 1308631 is 1368031.

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 1308631 - 2⁵ = 1308599 is a prime.

It is a super-2 number, since 2×1308631² = 3425030188322, 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 (1308611) 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, 28426 + ... + 28471.

It is an arithmetic number, because the mean of its divisors is an integer number (341388).

2^1308631 is an apocalyptic number.

1308631 is the 724-th centered pentagonal number.

1308631 is a deficient number, since it is larger than the sum of its proper divisors (56921).

1308631 is an equidigital number, since it uses as much as digits as its factorization.

1308631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56920.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1308631 is about 1143.9541074711. The cubic root of 1308631 is about 109.3802893769.

The spelling of 1308631 in words is "one million, three hundred eight thousand, six hundred thirty-one".