189135791 has 4 divisors (see below), whose sum is σ = 203684712. Its totient is φ = 174586872.

The previous prime is 189135763. The next prime is 189135811. The reversal of 189135791 is 197531981.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189135791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189135491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7274441 + ... + 7274466.

It is an arithmetic number, because the mean of its divisors is an integer number (50921178).

Almost surely, 2^189135791 is an apocalyptic number.

189135791 is a deficient number, since it is larger than the sum of its proper divisors (14548921).

189135791 is a wasteful number, since it uses less digits than its factorization.

189135791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14548920.

The product of its digits is 68040, while the sum is 44.

The square root of 189135791 is about 13752.6648690354. The cubic root of 189135791 is about 574.0167604684.

The spelling of 189135791 in words is "one hundred eighty-nine million, one hundred thirty-five thousand, seven hundred ninety-one".