87818971 has 2 divisors, whose sum is σ = 87818972. Its totient is φ = 87818970.

The previous prime is 87818959. The next prime is 87819013. The reversal of 87818971 is 17981878.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87818971 - 2⁹ = 87818459 is a prime.

It is not a weakly prime, because it can be changed into another prime (87818911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43909485 + 43909486.

It is an arithmetic number, because the mean of its divisors is an integer number (43909486).

Almost surely, 2^87818971 is an apocalyptic number.

87818971 is a deficient number, since it is larger than the sum of its proper divisors (1).

87818971 is an equidigital number, since it uses as much as digits as its factorization.

87818971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 49.

The square root of 87818971 is about 9371.1776741240. The cubic root of 87818971 is about 444.4908050227.

The spelling of 87818971 in words is "eighty-seven million, eight hundred eighteen thousand, nine hundred seventy-one".