987899931 has 12 divisors (see below), whose sum is σ = 1460152408. Its totient is φ = 643283424.

The previous prime is 987899929. The next prime is 987899989. The reversal of 987899931 is 139998789.

It is not a de Polignac number, because 987899931 - 2¹ = 987899929 is a prime.

It is a super-2 number, since 2×987899931² = 1951892547339609522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987899921) 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, 1275970 + ... + 1276743.

Almost surely, 2^987899931 is an apocalyptic number.

987899931 is a deficient number, since it is larger than the sum of its proper divisors (472252477).

987899931 is a wasteful number, since it uses less digits than its factorization.

987899931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2552762 (or 2552759 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 63.

The square root of 987899931 is about 31430.8754411964. The cubic root of 987899931 is about 995.9502654558.

The spelling of 987899931 in words is "nine hundred eighty-seven million, eight hundred ninety-nine thousand, nine hundred thirty-one".