12220631 has 4 divisors (see below), whose sum is σ = 12257232. Its totient is φ = 12184032.

The previous prime is 12220627. The next prime is 12220633. The reversal of 12220631 is 13602221.

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 12220631 - 2² = 12220627 is a prime.

It is a super-2 number, since 2×12220631² = 298687644076322, 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 (12220633) 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, 17795 + ... + 18468.

It is an arithmetic number, because the mean of its divisors is an integer number (3064308).

Almost surely, 2^12220631 is an apocalyptic number.

12220631 is a deficient number, since it is larger than the sum of its proper divisors (36601).

12220631 is an equidigital number, since it uses as much as digits as its factorization.

12220631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36600.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 12220631 is about 3495.8019108639. The cubic root of 12220631 is about 230.3374441856.

Adding to 12220631 its reverse (13602221), we get a palindrome (25822852).

The spelling of 12220631 in words is "twelve million, two hundred twenty thousand, six hundred thirty-one".