161879841 has 6 divisors (see below), whose sum is σ = 233826450. Its totient is φ = 107919888.

The previous prime is 161879813. The next prime is 161879843. The reversal of 161879841 is 148978161.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 134096400 + 27783441 = 11580^2 + 5271^2 .

It is not a de Polignac number, because 161879841 - 2²² = 157685537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161879843) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8993316 + ... + 8993333.

It is an arithmetic number, because the mean of its divisors is an integer number (38971075).

Almost surely, 2^161879841 is an apocalyptic number.

It is an amenable number.

161879841 is a deficient number, since it is larger than the sum of its proper divisors (71946609).

161879841 is a wasteful number, since it uses less digits than its factorization.

161879841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17986655 (or 17986652 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 161879841 is about 12723.2008944290. The cubic root of 161879841 is about 545.0013646404.

The spelling of 161879841 in words is "one hundred sixty-one million, eight hundred seventy-nine thousand, eight hundred forty-one".