1320631 has 16 divisors (see below), whose sum is σ = 1532160. Its totient is φ = 1128960.

The previous prime is 1320623. The next prime is 1320667. The reversal of 1320631 is 1360231.

It is a cyclic number.

It is not a de Polignac number, because 1320631 - 2³ = 1320623 is a prime.

It is a super-2 number, since 2×1320631² = 3488132476322, 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 (1320031) 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 15 ways as a sum of consecutive naturals, for example, 11631 + ... + 11743.

It is an arithmetic number, because the mean of its divisors is an integer number (95760).

2^1320631 is an apocalyptic number.

1320631 is a deficient number, since it is larger than the sum of its proper divisors (211529).

1320631 is a wasteful number, since it uses less digits than its factorization.

1320631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1320631 is about 1149.1871040000. The cubic root of 1320631 is about 109.7136076224.

Adding to 1320631 its reverse (1360231), we get a palindrome (2680862).

The spelling of 1320631 in words is "one million, three hundred twenty thousand, six hundred thirty-one".