161392172 has 24 divisors (see below), whose sum is σ = 291949056. Its totient is φ = 78020048.

The previous prime is 161392171. The next prime is 161392183. The reversal of 161392172 is 271293161.

161392172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161392171) 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, 10433 + ... + 20775.

It is an arithmetic number, because the mean of its divisors is an integer number (12164544).

Almost surely, 2^161392172 is an apocalyptic number.

It is an amenable number.

161392172 is a deficient number, since it is larger than the sum of its proper divisors (130556884).

161392172 is a wasteful number, since it uses less digits than its factorization.

161392172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10477 (or 10475 counting only the distinct ones).

The product of its digits is 4536, while the sum is 32.

The square root of 161392172 is about 12704.0218828527. The cubic root of 161392172 is about 544.4535352393.

The spelling of 161392172 in words is "one hundred sixty-one million, three hundred ninety-two thousand, one hundred seventy-two".