86818987 has 2 divisors, whose sum is σ = 86818988. Its totient is φ = 86818986.

The previous prime is 86818981. The next prime is 86819039. The reversal of 86818987 is 78981868.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86818987 is a prime.

It is not a weakly prime, because it can be changed into another prime (86818981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43409493 + 43409494.

It is an arithmetic number, because the mean of its divisors is an integer number (43409494).

Almost surely, 2^86818987 is an apocalyptic number.

86818987 is a deficient number, since it is larger than the sum of its proper divisors (1).

86818987 is an equidigital number, since it uses as much as digits as its factorization.

86818987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1548288, while the sum is 55.

The square root of 86818987 is about 9317.6706853162. The cubic root of 86818987 is about 442.7972395116.

The spelling of 86818987 in words is "eighty-six million, eight hundred eighteen thousand, nine hundred eighty-seven".