161168009 has 4 divisors (see below), whose sum is σ = 161194704. Its totient is φ = 161141316.

The previous prime is 161168003. The next prime is 161168017. The reversal of 161168009 is 900861161.

161168009 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 900861161 = 17 ⋅52991833.

It is a cyclic number.

It is not a de Polignac number, because 161168009 - 2²⁴ = 144390793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161168003) 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, 494 + ... + 17960.

It is an arithmetic number, because the mean of its divisors is an integer number (40298676).

Almost surely, 2^161168009 is an apocalyptic number.

It is an amenable number.

161168009 is a deficient number, since it is larger than the sum of its proper divisors (26695).

161168009 is an equidigital number, since it uses as much as digits as its factorization.

161168009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26694.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 161168009 is about 12695.1962962374. The cubic root of 161168009 is about 544.2013485219.

The spelling of 161168009 in words is "one hundred sixty-one million, one hundred sixty-eight thousand, nine".