189045891 has 24 divisors (see below), whose sum is σ = 281648640. Its totient is φ = 122123376.

The previous prime is 189045887. The next prime is 189045911. The reversal of 189045891 is 198540981.

It is not a de Polignac number, because 189045891 - 2² = 189045887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189045811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41400 + ... + 45738.

It is an arithmetic number, because the mean of its divisors is an integer number (11735360).

Almost surely, 2^189045891 is an apocalyptic number.

189045891 is a deficient number, since it is larger than the sum of its proper divisors (92602749).

189045891 is a wasteful number, since it uses less digits than its factorization.

189045891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4495 (or 4492 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 189045891 is about 13749.3960230986. The cubic root of 189045891 is about 573.9257988639.

The spelling of 189045891 in words is "one hundred eighty-nine million, forty-five thousand, eight hundred ninety-one".