86823809 has 2 divisors, whose sum is σ = 86823810. Its totient is φ = 86823808.

The previous prime is 86823797. The next prime is 86823817. The reversal of 86823809 is 90832868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46881409 + 39942400 = 6847^2 + 6320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86823809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86823809.

It is not a weakly prime, because it can be changed into another prime (86823829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43411904 + 43411905.

It is an arithmetic number, because the mean of its divisors is an integer number (43411905).

Almost surely, 2^86823809 is an apocalyptic number.

It is an amenable number.

86823809 is a deficient number, since it is larger than the sum of its proper divisors (1).

86823809 is an equidigital number, since it uses as much as digits as its factorization.

86823809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 86823809 is about 9317.9294373804. The cubic root of 86823809 is about 442.8054371376.

The spelling of 86823809 in words is "eighty-six million, eight hundred twenty-three thousand, eight hundred nine".