11513531 has 4 divisors (see below), whose sum is σ = 11550864. Its totient is φ = 11476200.

The previous prime is 11513527. The next prime is 11513587. The reversal of 11513531 is 13531511.

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 11513531 - 2² = 11513527 is a prime.

It is a super-2 number, since 2×11513531² = 265122792175922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11510531) 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, 18200 + ... + 18821.

It is an arithmetic number, because the mean of its divisors is an integer number (2887716).

Almost surely, 2^11513531 is an apocalyptic number.

11513531 is a deficient number, since it is larger than the sum of its proper divisors (37333).

11513531 is an equidigital number, since it uses as much as digits as its factorization.

11513531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37332.

The product of its digits is 225, while the sum is 20.

The square root of 11513531 is about 3393.1594421719. The cubic root of 11513531 is about 225.8063642793.

The spelling of 11513531 in words is "eleven million, five hundred thirteen thousand, five hundred thirty-one".