631866987 has 10 divisors (see below), whose sum is σ = 943900188. Its totient is φ = 421244604.

The previous prime is 631866979. The next prime is 631867039. The reversal of 631866987 is 789668136.

It is a happy number.

631866987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 631866987 - 2³ = 631866979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (631866947) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3900333 + ... + 3900494.

Almost surely, 2^631866987 is an apocalyptic number.

631866987 is a deficient number, since it is larger than the sum of its proper divisors (312033201).

631866987 is an equidigital number, since it uses as much as digits as its factorization.

631866987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7800839 (or 7800830 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 631866987 is about 25136.9645542178. The cubic root of 631866987 is about 858.1078767974.

The spelling of 631866987 in words is "six hundred thirty-one million, eight hundred sixty-six thousand, nine hundred eighty-seven".