809476961 has 4 divisors (see below), whose sum is σ = 809635524. Its totient is φ = 809318400.

The previous prime is 809476951. The next prime is 809476963. The reversal of 809476961 is 169674908.

809476961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 512569600 + 296907361 = 22640^2 + 17231^2 .

It is a cyclic number.

It is not a de Polignac number, because 809476961 - 2¹⁴ = 809460577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809476963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71360 + ... + 81921.

It is an arithmetic number, because the mean of its divisors is an integer number (202408881).

Almost surely, 2^809476961 is an apocalyptic number.

It is an amenable number.

809476961 is a deficient number, since it is larger than the sum of its proper divisors (158563).

809476961 is a wasteful number, since it uses less digits than its factorization.

809476961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158562.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 809476961 is about 28451.3085990785. The cubic root of 809476961 is about 931.9690661416.

The spelling of 809476961 in words is "eight hundred nine million, four hundred seventy-six thousand, nine hundred sixty-one".