11687431 has 6 divisors (see below), whose sum is σ = 13595640. Its totient is φ = 10017756.

The previous prime is 11687407. The next prime is 11687441. The reversal of 11687431 is 13478611.

11687431 = T₃₂₃ + T₃₂₄ + ... + T₄₆₉.

It is not a de Polignac number, because 11687431 - 2⁵ = 11687399 is a prime.

It is a super-2 number, since 2×11687431² = 273192086759522, 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 = 11687393 and 11687402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11687441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119211 + ... + 119308.

It is an arithmetic number, because the mean of its divisors is an integer number (2265940).

Almost surely, 2^11687431 is an apocalyptic number.

11687431 is a deficient number, since it is larger than the sum of its proper divisors (1908209).

11687431 is an equidigital number, since it uses as much as digits as its factorization.

11687431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238533 (or 238526 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 11687431 is about 3418.6884912200. The cubic root of 11687431 is about 226.9375454854.

The spelling of 11687431 in words is "eleven million, six hundred eighty-seven thousand, four hundred thirty-one".