11687531 has 4 divisors (see below), whose sum is σ = 11709072. Its totient is φ = 11665992.

The previous prime is 11687521. The next prime is 11687563. The reversal of 11687531 is 13578611.

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 11687531 - 2¹⁴ = 11671147 is a prime.

It is a super-2 number, since 2×11687531² = 273196761751922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11687521) 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, 9935 + ... + 11048.

It is an arithmetic number, because the mean of its divisors is an integer number (2927268).

Almost surely, 2^11687531 is an apocalyptic number.

11687531 is a deficient number, since it is larger than the sum of its proper divisors (21541).

11687531 is an equidigital number, since it uses as much as digits as its factorization.

11687531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21540.

The product of its digits is 5040, while the sum is 32.

The square root of 11687531 is about 3418.7031166804. The cubic root of 11687531 is about 226.9381927246.

The spelling of 11687531 in words is "eleven million, six hundred eighty-seven thousand, five hundred thirty-one".