161394081 has 16 divisors (see below), whose sum is σ = 223110720. Its totient is φ = 103700480.

The previous prime is 161394067. The next prime is 161394109. The reversal of 161394081 is 180493161.

It is not a de Polignac number, because 161394081 - 2⁶ = 161394017 is a prime.

It is a super-2 number, since 2×161394081² = 52096098763669122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161394031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2305 + ... + 18113.

It is an arithmetic number, because the mean of its divisors is an integer number (13944420).

Almost surely, 2^161394081 is an apocalyptic number.

It is an amenable number.

161394081 is a deficient number, since it is larger than the sum of its proper divisors (61716639).

161394081 is a wasteful number, since it uses less digits than its factorization.

161394081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15936.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 161394081 is about 12704.0970163172. The cubic root of 161394081 is about 544.4556818897.

The spelling of 161394081 in words is "one hundred sixty-one million, three hundred ninety-four thousand, eighty-one".