809161 has 4 divisors (see below), whose sum is σ = 811024. Its totient is φ = 807300.

The previous prime is 809147. The next prime is 809173. The reversal of 809161 is 161908.

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 not a de Polignac number, because 809161 - 2¹¹ = 807113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809101) 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, 106 + ... + 1276.

It is an arithmetic number, because the mean of its divisors is an integer number (202756).

2⁸⁰⁹¹⁶¹ is an apocalyptic number.

It is an amenable number.

809161 is a deficient number, since it is larger than the sum of its proper divisors (1863).

809161 is a wasteful number, since it uses less digits than its factorization.

809161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1862.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 809161 is about 899.5337681266. The cubic root of 809161 is about 93.1847792688.

The spelling of 809161 in words is "eight hundred nine thousand, one hundred sixty-one".