987816931 has 2 divisors, whose sum is σ = 987816932. Its totient is φ = 987816930.

The previous prime is 987816917. The next prime is 987816961. The reversal of 987816931 is 139618789.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 987816931 - 2¹⁹ = 987292643 is a prime.

It is a super-2 number, since 2×987816931² = 1951564578340517522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (987816901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493908465 + 493908466.

It is an arithmetic number, because the mean of its divisors is an integer number (493908466).

Almost surely, 2^987816931 is an apocalyptic number.

987816931 is a deficient number, since it is larger than the sum of its proper divisors (1).

987816931 is an equidigital number, since it uses as much as digits as its factorization.

987816931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 52.

The square root of 987816931 is about 31429.5550557115. Note that the first 3 decimals coincide. The cubic root of 987816931 is about 995.9223725540.

The spelling of 987816931 in words is "nine hundred eighty-seven million, eight hundred sixteen thousand, nine hundred thirty-one".