111979161 has 36 divisors (see below), whose sum is σ = 194248704. Its totient is φ = 61916400.

The previous prime is 111979129. The next prime is 111979169. The reversal of 111979161 is 161979111.

It is not a de Polignac number, because 111979161 - 2⁵ = 111979129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111979169) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9576 + ... + 17766.

Almost surely, 2^111979161 is an apocalyptic number.

It is an amenable number.

111979161 is a deficient number, since it is larger than the sum of its proper divisors (82269543).

111979161 is a wasteful number, since it uses less digits than its factorization.

111979161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8242 (or 8232 counting only the distinct ones).

The product of its digits is 3402, while the sum is 36.

The square root of 111979161 is about 10582.0206482505. The cubic root of 111979161 is about 481.9985551744.

The spelling of 111979161 in words is "one hundred eleven million, nine hundred seventy-nine thousand, one hundred sixty-one".