11513631 has 4 divisors (see below), whose sum is σ = 15351512. Its totient is φ = 7675752.

The previous prime is 11513629. The next prime is 11513647. The reversal of 11513631 is 13631511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13631511 = 3 ⋅4543837.

It is not a de Polignac number, because 11513631 - 2¹ = 11513629 is a prime.

It is a super-2 number, since 2×11513631² = 265127397608322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11513598 and 11513607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11515631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1918936 + ... + 1918941.

It is an arithmetic number, because the mean of its divisors is an integer number (3837878).

Almost surely, 2^11513631 is an apocalyptic number.

11513631 is a deficient number, since it is larger than the sum of its proper divisors (3837881).

11513631 is an equidigital number, since it uses as much as digits as its factorization.

11513631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3837880.

The product of its digits is 270, while the sum is 21.

The square root of 11513631 is about 3393.1741776690. The cubic root of 11513631 is about 225.8070180194.

The spelling of 11513631 in words is "eleven million, five hundred thirteen thousand, six hundred thirty-one".