817168161 has 4 divisors (see below), whose sum is σ = 1089557552. Its totient is φ = 544778772.

The previous prime is 817168159. The next prime is 817168211. The reversal of 817168161 is 161861718.

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 not a de Polignac number, because 817168161 - 2¹ = 817168159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (817168141) 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, 136194691 + ... + 136194696.

It is an arithmetic number, because the mean of its divisors is an integer number (272389388).

Almost surely, 2^817168161 is an apocalyptic number.

It is an amenable number.

817168161 is a deficient number, since it is larger than the sum of its proper divisors (272389391).

817168161 is a wasteful number, since it uses less digits than its factorization.

817168161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272389390.

The product of its digits is 16128, while the sum is 39.

The square root of 817168161 is about 28586.1533089011. The cubic root of 817168161 is about 934.9114507161.

The spelling of 817168161 in words is "eight hundred seventeen million, one hundred sixty-eight thousand, one hundred sixty-one".