87931971 has 12 divisors (see below), whose sum is σ = 129715872. Its totient is φ = 57373776.

The previous prime is 87931969. The next prime is 87931979. The reversal of 87931971 is 17913978.

It is not a de Polignac number, because 87931971 - 2¹ = 87931969 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (87931979) 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, 103516 + ... + 104361.

It is an arithmetic number, because the mean of its divisors is an integer number (10809656).

Almost surely, 2^87931971 is an apocalyptic number.

87931971 is a deficient number, since it is larger than the sum of its proper divisors (41783901).

87931971 is a wasteful number, since it uses less digits than its factorization.

87931971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207930 (or 207927 counting only the distinct ones).

The product of its digits is 95256, while the sum is 45.

The square root of 87931971 is about 9377.2048607248. The cubic root of 87931971 is about 444.6813710344.

The spelling of 87931971 in words is "eighty-seven million, nine hundred thirty-one thousand, nine hundred seventy-one".