161937128 has 16 divisors (see below), whose sum is σ = 304709280. Its totient is φ = 80681328.

The previous prime is 161937119. The next prime is 161937161. The reversal of 161937128 is 821739161.

It is a junction number, because it is equal to n+sod(n) for n = 161937091 and 161937100.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33500 + ... + 38027.

It is an arithmetic number, because the mean of its divisors is an integer number (19044330).

Almost surely, 2^161937128 is an apocalyptic number.

It is an amenable number.

161937128 is a deficient number, since it is larger than the sum of its proper divisors (142772152).

161937128 is a wasteful number, since it uses less digits than its factorization.

161937128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71816 (or 71812 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The square root of 161937128 is about 12725.4519762561. The cubic root of 161937128 is about 545.0656464986.

The spelling of 161937128 in words is "one hundred sixty-one million, nine hundred thirty-seven thousand, one hundred twenty-eight".