189317945 has 16 divisors (see below), whose sum is σ = 245237760. Its totient is φ = 139871424.

The previous prime is 189317941. The next prime is 189317963. The reversal of 189317945 is 549713981.

It is a cyclic number.

It is not a de Polignac number, because 189317945 - 2² = 189317941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189317945.

It is not an unprimeable number, because it can be changed into a prime (189317941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25049 + ... + 31718.

It is an arithmetic number, because the mean of its divisors is an integer number (15327360).

Almost surely, 2^189317945 is an apocalyptic number.

It is an amenable number.

189317945 is a deficient number, since it is larger than the sum of its proper divisors (55919815).

189317945 is a wasteful number, since it uses less digits than its factorization.

189317945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56824.

The product of its digits is 272160, while the sum is 47.

The square root of 189317945 is about 13759.2857736148. The cubic root of 189317945 is about 574.2009771447.

The spelling of 189317945 in words is "one hundred eighty-nine million, three hundred seventeen thousand, nine hundred forty-five".