11931687 has 12 divisors (see below), whose sum is σ = 17984304. Its totient is φ = 7608480.

The previous prime is 11931613. The next prime is 11931691. The reversal of 11931687 is 78613911.

It is not a de Polignac number, because 11931687 - 2⁸ = 11931431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11933687) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28614 + ... + 29027.

It is an arithmetic number, because the mean of its divisors is an integer number (1498692).

Almost surely, 2^11931687 is an apocalyptic number.

11931687 is a deficient number, since it is larger than the sum of its proper divisors (6052617).

11931687 is a wasteful number, since it uses less digits than its factorization.

11931687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57670 (or 57667 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 11931687 is about 3454.2274100007. The cubic root of 11931687 is about 228.5075833773.

The spelling of 11931687 in words is "eleven million, nine hundred thirty-one thousand, six hundred eighty-seven".