117566809 has 2 divisors, whose sum is σ = 117566810. Its totient is φ = 117566808.

The previous prime is 117566767. The next prime is 117566863. The reversal of 117566809 is 908665711.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113486409 + 4080400 = 10653^2 + 2020^2 .

It is a cyclic number.

It is not a de Polignac number, because 117566809 - 2¹⁷ = 117435737 is a prime.

It is not a weakly prime, because it can be changed into another prime (117566209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58783404 + 58783405.

It is an arithmetic number, because the mean of its divisors is an integer number (58783405).

Almost surely, 2^117566809 is an apocalyptic number.

It is an amenable number.

117566809 is a deficient number, since it is larger than the sum of its proper divisors (1).

117566809 is an equidigital number, since it uses as much as digits as its factorization.

117566809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 117566809 is about 10842.8229257883. The cubic root of 117566809 is about 489.8858667954.

The spelling of 117566809 in words is "one hundred seventeen million, five hundred sixty-six thousand, eight hundred nine".