870446809 has 2 divisors, whose sum is σ = 870446810. Its totient is φ = 870446808.

The previous prime is 870446777. The next prime is 870446839. The reversal of 870446809 is 908644078.

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., 673662025 + 196784784 = 25955^2 + 14028^2 .

It is a cyclic number.

It is not a de Polignac number, because 870446809 - 2⁵ = 870446777 is a prime.

It is not a weakly prime, because it can be changed into another prime (870446839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435223404 + 435223405.

It is an arithmetic number, because the mean of its divisors is an integer number (435223405).

Almost surely, 2^870446809 is an apocalyptic number.

It is an amenable number.

870446809 is a deficient number, since it is larger than the sum of its proper divisors (1).

870446809 is an equidigital number, since it uses as much as digits as its factorization.

870446809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 870446809 is about 29503.3355571874. The cubic root of 870446809 is about 954.8036689687.

The spelling of 870446809 in words is "eight hundred seventy million, four hundred forty-six thousand, eight hundred nine".