83807809 has 2 divisors, whose sum is σ = 83807810. Its totient is φ = 83807808.

The previous prime is 83807777. The next prime is 83807819. The reversal of 83807809 is 90870838.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75742209 + 8065600 = 8703^2 + 2840^2 .

It is a cyclic number.

It is not a de Polignac number, because 83807809 - 2⁵ = 83807777 is a prime.

It is equal to p_4878466 and since 83807809 and 4878466 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (83807819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41903904 + 41903905.

It is an arithmetic number, because the mean of its divisors is an integer number (41903905).

Almost surely, 2^83807809 is an apocalyptic number.

It is an amenable number.

83807809 is a deficient number, since it is larger than the sum of its proper divisors (1).

83807809 is an equidigital number, since it uses as much as digits as its factorization.

83807809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 83807809 is about 9154.6605070860. The cubic root of 83807809 is about 437.6176493393.

The spelling of 83807809 in words is "eighty-three million, eight hundred seven thousand, eight hundred nine".