189319491 has 16 divisors (see below), whose sum is σ = 288055200. Its totient is φ = 122801184.

The previous prime is 189319483. The next prime is 189319513. The reversal of 189319491 is 194913981.

It is not a de Polignac number, because 189319491 - 2³ = 189319483 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (189319451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93756 + ... + 95753.

It is an arithmetic number, because the mean of its divisors is an integer number (18003450).

Almost surely, 2^189319491 is an apocalyptic number.

189319491 is a deficient number, since it is larger than the sum of its proper divisors (98735709).

189319491 is a wasteful number, since it uses less digits than its factorization.

189319491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189555 (or 189549 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 189319491 is about 13759.3419537418. The cubic root of 189319491 is about 574.2025401455.

The spelling of 189319491 in words is "one hundred eighty-nine million, three hundred nineteen thousand, four hundred ninety-one".