86499509 has 2 divisors, whose sum is σ = 86499510. Its totient is φ = 86499508.

The previous prime is 86499461. The next prime is 86499541. The reversal of 86499509 is 90599468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79263409 + 7236100 = 8903^2 + 2690^2 .

It is a cyclic number.

It is not a de Polignac number, because 86499509 - 2⁸ = 86499253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86499559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43249754 + 43249755.

It is an arithmetic number, because the mean of its divisors is an integer number (43249755).

Almost surely, 2^86499509 is an apocalyptic number.

It is an amenable number.

86499509 is a deficient number, since it is larger than the sum of its proper divisors (1).

86499509 is an equidigital number, since it uses as much as digits as its factorization.

86499509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 86499509 is about 9300.5112225081. The cubic root of 86499509 is about 442.2534343007.

The spelling of 86499509 in words is "eighty-six million, four hundred ninety-nine thousand, five hundred nine".