189168985 has 4 divisors (see below), whose sum is σ = 227002788. Its totient is φ = 151335184.

The previous prime is 189168977. The next prime is 189168989. The reversal of 189168985 is 589861981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103550976 + 85618009 = 10176^2 + 9253^2 .

It is a cyclic number.

It is not a de Polignac number, because 189168985 - 2³ = 189168977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189168989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18916894 + ... + 18916903.

It is an arithmetic number, because the mean of its divisors is an integer number (56750697).

Almost surely, 2^189168985 is an apocalyptic number.

It is an amenable number.

189168985 is a deficient number, since it is larger than the sum of its proper divisors (37833803).

189168985 is an equidigital number, since it uses as much as digits as its factorization.

189168985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37833802.

The product of its digits is 1244160, while the sum is 55.

The square root of 189168985 is about 13753.8716367429. The cubic root of 189168985 is about 574.0503391610.

It can be divided in two parts, 1891 and 68985, that added together give a triangular number (70876 = T₃₇₆).

The spelling of 189168985 in words is "one hundred eighty-nine million, one hundred sixty-eight thousand, nine hundred eighty-five".