11631 has 4 divisors (see below), whose sum is σ = 15512. Its totient is φ = 7752.

The previous prime is 11621. The next prime is 11633. The reversal of 11631 is 13611.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11631 - 2⁷ = 11503 is a prime.

It is a super-2 number, since 2×11631² = 270560322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 11631.

It is not an unprimeable number, because it can be changed into a prime (11633) 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, 1936 + ... + 1941.

It is an arithmetic number, because the mean of its divisors is an integer number (3878).

2¹¹⁶³¹ is an apocalyptic number.

11631 is a deficient number, since it is larger than the sum of its proper divisors (3881).

11631 is an equidigital number, since it uses as much as digits as its factorization.

11631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3880.

The product of its digits is 18, while the sum is 12.

The square root of 11631 is about 107.8471140087. The cubic root of 11631 is about 22.6571711476.

The spelling of 11631 in words is "eleven thousand, six hundred thirty-one".