11820631 has 4 divisors (see below), whose sum is σ = 11852200. Its totient is φ = 11789064.

The previous prime is 11820607. The next prime is 11820647. The reversal of 11820631 is 13602811.

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 11820631 - 2²¹ = 9723479 is a prime.

It is a super-2 number, since 2×11820631² = 279454634476322, 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 (11821631) 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, 15216 + ... + 15973.

It is an arithmetic number, because the mean of its divisors is an integer number (2963050).

Almost surely, 2^11820631 is an apocalyptic number.

11820631 is a deficient number, since it is larger than the sum of its proper divisors (31569).

11820631 is an equidigital number, since it uses as much as digits as its factorization.

11820631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31568.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 11820631 is about 3438.1144541740. The cubic root of 11820631 is about 227.7964159424.

The spelling of 11820631 in words is "eleven million, eight hundred twenty thousand, six hundred thirty-one".