86982979 has 2 divisors, whose sum is σ = 86982980. Its totient is φ = 86982978.

The previous prime is 86982949. The next prime is 86982997. The reversal of 86982979 is 97928968.

Together with next prime (86982997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86982979 is a prime.

It is not a weakly prime, because it can be changed into another prime (86982949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43491489 + 43491490.

It is an arithmetic number, because the mean of its divisors is an integer number (43491490).

Almost surely, 2^86982979 is an apocalyptic number.

86982979 is a deficient number, since it is larger than the sum of its proper divisors (1).

86982979 is an equidigital number, since it uses as much as digits as its factorization.

86982979 is an evil number, because the sum of its binary digits is even.

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

The square root of 86982979 is about 9326.4665870843. The cubic root of 86982979 is about 443.0758634028.

The spelling of 86982979 in words is "eighty-six million, nine hundred eighty-two thousand, nine hundred seventy-nine".