11561631 has 8 divisors (see below), whose sum is σ = 15791664. Its totient is φ = 7519680.

The previous prime is 11561629. The next prime is 11561639. The reversal of 11561631 is 13616511.

11561631 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11561631 - 2¹ = 11561629 is a prime.

It is a super-2 number, since 2×11561631² = 267342622760322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561639) 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 7 ways as a sum of consecutive naturals, for example, 46876 + ... + 47121.

It is an arithmetic number, because the mean of its divisors is an integer number (1973958).

Almost surely, 2^11561631 is an apocalyptic number.

11561631 is a deficient number, since it is larger than the sum of its proper divisors (4230033).

11561631 is an equidigital number, since it uses as much as digits as its factorization.

11561631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94041.

The product of its digits is 540, while the sum is 24.

The square root of 11561631 is about 3400.2398444816. The cubic root of 11561631 is about 226.1203773042.

The spelling of 11561631 in words is "eleven million, five hundred sixty-one thousand, six hundred thirty-one".