870740809 has 2 divisors, whose sum is σ = 870740810. Its totient is φ = 870740808.

The previous prime is 870740789. The next prime is 870740881. The reversal of 870740809 is 908047078.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 829267209 + 41473600 = 28797^2 + 6440^2 .

It is a cyclic number.

It is not a de Polignac number, because 870740809 - 2⁷ = 870740681 is a prime.

It is not a weakly prime, because it can be changed into another prime (870750809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435370404 + 435370405.

It is an arithmetic number, because the mean of its divisors is an integer number (435370405).

Almost surely, 2^870740809 is an apocalyptic number.

It is an amenable number.

870740809 is a deficient number, since it is larger than the sum of its proper divisors (1).

870740809 is an equidigital number, since it uses as much as digits as its factorization.

870740809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 870740809 is about 29508.3176240192. The cubic root of 870740809 is about 954.9111542577.

The spelling of 870740809 in words is "eight hundred seventy million, seven hundred forty thousand, eight hundred nine".