12211631 has 4 divisors (see below), whose sum is σ = 12220992. Its totient is φ = 12202272.

The previous prime is 12211603. The next prime is 12211657. The reversal of 12211631 is 13611221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 12211631 - 2²² = 8017327 is a prime.

It is a super-2 number, since 2×12211631² = 298247863360322, 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 (12211231) 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, 2330 + ... + 5463.

It is an arithmetic number, because the mean of its divisors is an integer number (3055248).

Almost surely, 2^12211631 is an apocalyptic number.

12211631 is a deficient number, since it is larger than the sum of its proper divisors (9361).

12211631 is an equidigital number, since it uses as much as digits as its factorization.

12211631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9360.

The product of its digits is 72, while the sum is 17.

The square root of 12211631 is about 3494.5144154804. The cubic root of 12211631 is about 230.2808855647.

Adding to 12211631 its reverse (13611221), we get a palindrome (25822852).

The spelling of 12211631 in words is "twelve million, two hundred eleven thousand, six hundred thirty-one".