87816973 has 2 divisors, whose sum is σ = 87816974. Its totient is φ = 87816972.

The previous prime is 87816941. The next prime is 87816977. The reversal of 87816973 is 37961878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83503044 + 4313929 = 9138^2 + 2077^2 .

It is a cyclic number.

It is not a de Polignac number, because 87816973 - 2⁵ = 87816941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87816977) 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, 43908486 + 43908487.

It is an arithmetic number, because the mean of its divisors is an integer number (43908487).

Almost surely, 2^87816973 is an apocalyptic number.

It is an amenable number.

87816973 is a deficient number, since it is larger than the sum of its proper divisors (1).

87816973 is an equidigital number, since it uses as much as digits as its factorization.

87816973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 49.

The square root of 87816973 is about 9371.0710700538. The cubic root of 87816973 is about 444.4874340754.

The spelling of 87816973 in words is "eighty-seven million, eight hundred sixteen thousand, nine hundred seventy-three".