11965631 has 4 divisors (see below), whose sum is σ = 11992272. Its totient is φ = 11938992.

The previous prime is 11965627. The next prime is 11965643. The reversal of 11965631 is 13656911.

It is a happy number.

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 11965631 - 2² = 11965627 is a prime.

It is a super-2 number, since 2×11965631² = 286352650456322, 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 (11965621) 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, 12635 + ... + 13548.

It is an arithmetic number, because the mean of its divisors is an integer number (2998068).

Almost surely, 2^11965631 is an apocalyptic number.

11965631 is a deficient number, since it is larger than the sum of its proper divisors (26641).

11965631 is an equidigital number, since it uses as much as digits as its factorization.

11965631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26640.

The product of its digits is 4860, while the sum is 32.

The square root of 11965631 is about 3459.1373201999. The cubic root of 11965631 is about 228.7240690444.

The spelling of 11965631 in words is "eleven million, nine hundred sixty-five thousand, six hundred thirty-one".