809628161 has 4 divisors (see below), whose sum is σ = 809975472. Its totient is φ = 809280852.

The previous prime is 809628151. The next prime is 809628199. The reversal of 809628161 is 161826908.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809628161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809628121) 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, 170135 + ... + 174828.

It is an arithmetic number, because the mean of its divisors is an integer number (202493868).

Almost surely, 2^809628161 is an apocalyptic number.

It is an amenable number.

809628161 is a deficient number, since it is larger than the sum of its proper divisors (347311).

809628161 is a wasteful number, since it uses less digits than its factorization.

809628161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347310.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 809628161 is about 28453.9656462856. The cubic root of 809628161 is about 932.0270891848.

The spelling of 809628161 in words is "eight hundred nine million, six hundred twenty-eight thousand, one hundred sixty-one".