161975156 has 24 divisors (see below), whose sum is σ = 324487296. Its totient is φ = 69302880.

The previous prime is 161975153. The next prime is 161975161. The reversal of 161975156 is 651579161.

161975156 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161975156² = 52471902322448672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161975153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13646 + ... + 22586.

It is an arithmetic number, because the mean of its divisors is an integer number (13520304).

Almost surely, 2^161975156 is an apocalyptic number.

It is an amenable number.

161975156 is an abundant number, since it is smaller than the sum of its proper divisors (162512140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161975156 is a wasteful number, since it uses less digits than its factorization.

161975156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9599 (or 9597 counting only the distinct ones).

The product of its digits is 56700, while the sum is 41.

The square root of 161975156 is about 12726.9460594441. The cubic root of 161975156 is about 545.1083094225.

The spelling of 161975156 in words is "one hundred sixty-one million, nine hundred seventy-five thousand, one hundred fifty-six".