859950809 has 2 divisors, whose sum is σ = 859950810. Its totient is φ = 859950808.

The previous prime is 859950803. The next prime is 859950821. The reversal of 859950809 is 908059958.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 763969600 + 95981209 = 27640^2 + 9797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-859950809 is a prime.

It is not a weakly prime, because it can be changed into another prime (859950803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429975404 + 429975405.

It is an arithmetic number, because the mean of its divisors is an integer number (429975405).

Almost surely, 2^859950809 is an apocalyptic number.

It is an amenable number.

859950809 is a deficient number, since it is larger than the sum of its proper divisors (1).

859950809 is an equidigital number, since it uses as much as digits as its factorization.

859950809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1166400, while the sum is 53.

The square root of 859950809 is about 29324.9178856480. The cubic root of 859950809 is about 950.9504095285.

The spelling of 859950809 in words is "eight hundred fifty-nine million, nine hundred fifty thousand, eight hundred nine".