86992987 has 2 divisors, whose sum is σ = 86992988. Its totient is φ = 86992986.

The previous prime is 86992949. The next prime is 86992991. The reversal of 86992987 is 78929968.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86992987 is a prime.

It is not a weakly prime, because it can be changed into another prime (86992907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43496493 + 43496494.

It is an arithmetic number, because the mean of its divisors is an integer number (43496494).

Almost surely, 2^86992987 is an apocalyptic number.

86992987 is a deficient number, since it is larger than the sum of its proper divisors (1).

86992987 is an equidigital number, since it uses as much as digits as its factorization.

86992987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 58.

The square root of 86992987 is about 9327.0031092522. The cubic root of 86992987 is about 443.0928557433.

Subtracting from 86992987 its sum of digits (58), we obtain a square (86992929 = 9327²).

The spelling of 86992987 in words is "eighty-six million, nine hundred ninety-two thousand, nine hundred eighty-seven".