87316819 has 2 divisors, whose sum is σ = 87316820. Its totient is φ = 87316818.

The previous prime is 87316793. The next prime is 87316847. The reversal of 87316819 is 91861378.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87316819 is a prime.

It is a super-2 number, since 2×87316819² = 15248453760557522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87316849) 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, 43658409 + 43658410.

It is an arithmetic number, because the mean of its divisors is an integer number (43658410).

Almost surely, 2^87316819 is an apocalyptic number.

87316819 is a deficient number, since it is larger than the sum of its proper divisors (1).

87316819 is an equidigital number, since it uses as much as digits as its factorization.

87316819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 43.

The square root of 87316819 is about 9344.3469006667. The cubic root of 87316819 is about 443.6419803464.

The spelling of 87316819 in words is "eighty-seven million, three hundred sixteen thousand, eight hundred nineteen".