11631631 has 4 divisors (see below), whose sum is σ = 12689064. Its totient is φ = 10574200.

The previous prime is 11631623. The next prime is 11631637. The reversal of 11631631 is 13613611.

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 11631631 - 2³ = 11631623 is a prime.

It is a super-2 number, since 2×11631631² = 270589679440322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11631637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528700 + ... + 528721.

It is an arithmetic number, because the mean of its divisors is an integer number (3172266).

Almost surely, 2^11631631 is an apocalyptic number.

11631631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11631631 is a deficient number, since it is larger than the sum of its proper divisors (1057433).

11631631 is a wasteful number, since it uses less digits than its factorization.

11631631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057432.

The product of its digits is 324, while the sum is 22.

The square root of 11631631 is about 3410.5177026369. The cubic root of 11631631 is about 226.5758086926.

The spelling of 11631631 in words is "eleven million, six hundred thirty-one thousand, six hundred thirty-one".