189979161 has 8 divisors (see below), whose sum is σ = 253370400. Its totient is φ = 126620352.

The previous prime is 189979159. The next prime is 189979169. The reversal of 189979161 is 161979981.

189979161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 189979161 - 2¹ = 189979159 is a prime.

It is a super-2 number, since 2×189979161² = 72184163228527842, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (189979169) 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, 14865 + ... + 24513.

It is an arithmetic number, because the mean of its divisors is an integer number (31671300).

Almost surely, 2^189979161 is an apocalyptic number.

It is an amenable number.

189979161 is a deficient number, since it is larger than the sum of its proper divisors (63391239).

189979161 is an equidigital number, since it uses as much as digits as its factorization.

189979161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16215.

The product of its digits is 244944, while the sum is 51.

The square root of 189979161 is about 13783.2928213834. The cubic root of 189979161 is about 574.8686893600.

The spelling of 189979161 in words is "one hundred eighty-nine million, nine hundred seventy-nine thousand, one hundred sixty-one".