111992161 has 8 divisors (see below), whose sum is σ = 113335040. Its totient is φ = 110657232.

The previous prime is 111992123. The next prime is 111992173. The reversal of 111992161 is 161299111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111992161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111992191) 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, 29191 + ... + 32803.

It is an arithmetic number, because the mean of its divisors is an integer number (14166880).

Almost surely, 2^111992161 is an apocalyptic number.

It is an amenable number.

111992161 is a deficient number, since it is larger than the sum of its proper divisors (1342879).

111992161 is a wasteful number, since it uses less digits than its factorization.

111992161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3975.

The product of its digits is 972, while the sum is 31.

The square root of 111992161 is about 10582.6348798397. The cubic root of 111992161 is about 482.0172066767.

The spelling of 111992161 in words is "one hundred eleven million, nine hundred ninety-two thousand, one hundred sixty-one".