161975212 has 24 divisors (see below), whose sum is σ = 326430720. Its totient is φ = 68886480.

The previous prime is 161975197. The next prime is 161975221. The reversal of 161975212 is 212579161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18412 + ... + 25747.

It is an arithmetic number, because the mean of its divisors is an integer number (13601280).

Almost surely, 2^161975212 is an apocalyptic number.

It is an amenable number.

161975212 is an abundant number, since it is smaller than the sum of its proper divisors (164455508).

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

161975212 is a wasteful number, since it uses less digits than its factorization.

161975212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44301 (or 44299 counting only the distinct ones).

The product of its digits is 7560, while the sum is 34.

The square root of 161975212 is about 12726.9482595004. The cubic root of 161975212 is about 545.1083722430.

The spelling of 161975212 in words is "one hundred sixty-one million, nine hundred seventy-five thousand, two hundred twelve".