11631987 has 24 divisors (see below), whose sum is σ = 17821440. Its totient is φ = 7297920.

The previous prime is 11631947. The next prime is 11631989. The reversal of 11631987 is 78913611.

11631987 is a `hidden beast` number, since 11 + 631 + 9 + 8 + 7 = 666.

It is not a de Polignac number, because 11631987 - 2⁸ = 11631731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11631989) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10158 + ... + 11244.

It is an arithmetic number, because the mean of its divisors is an integer number (742560).

Almost surely, 2^11631987 is an apocalyptic number.

11631987 is a deficient number, since it is larger than the sum of its proper divisors (6189453).

11631987 is a wasteful number, since it uses less digits than its factorization.

11631987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163 (or 1160 counting only the distinct ones).

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

The square root of 11631987 is about 3410.5698937274. The cubic root of 11631987 is about 226.5781202104.

The spelling of 11631987 in words is "eleven million, six hundred thirty-one thousand, nine hundred eighty-seven".