86942521 has 2 divisors, whose sum is σ = 86942522. Its totient is φ = 86942520.

The previous prime is 86942501. The next prime is 86942533. The reversal of 86942521 is 12524968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66194496 + 20748025 = 8136^2 + 4555^2 .

It is a cyclic number.

It is not a de Polignac number, because 86942521 - 2⁷ = 86942393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86942501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43471260 + 43471261.

It is an arithmetic number, because the mean of its divisors is an integer number (43471261).

Almost surely, 2^86942521 is an apocalyptic number.

It is an amenable number.

86942521 is a deficient number, since it is larger than the sum of its proper divisors (1).

86942521 is an equidigital number, since it uses as much as digits as its factorization.

86942521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 37.

The square root of 86942521 is about 9324.2973461811. The cubic root of 86942521 is about 443.0071574580.

The spelling of 86942521 in words is "eighty-six million, nine hundred forty-two thousand, five hundred twenty-one".