11686531 has 4 divisors (see below), whose sum is σ = 12373992. Its totient is φ = 10999072.

The previous prime is 11686523. The next prime is 11686537. The reversal of 11686531 is 13568611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13568611 = 7 ⋅1938373.

It is a cyclic number.

It is not a de Polignac number, because 11686531 - 2³ = 11686523 is a prime.

It is a super-2 number, since 2×11686531² = 273150013627922, 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 = 11686493 and 11686502.

It is not an unprimeable number, because it can be changed into a prime (11686537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343705 + ... + 343738.

It is an arithmetic number, because the mean of its divisors is an integer number (3093498).

Almost surely, 2^11686531 is an apocalyptic number.

11686531 is a deficient number, since it is larger than the sum of its proper divisors (687461).

11686531 is an equidigital number, since it uses as much as digits as its factorization.

11686531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687460.

The product of its digits is 4320, while the sum is 31.

The square root of 11686531 is about 3418.5568592609. The cubic root of 11686531 is about 226.9317201667.

The spelling of 11686531 in words is "eleven million, six hundred eighty-six thousand, five hundred thirty-one".