189289109 has 4 divisors (see below), whose sum is σ = 189338604. Its totient is φ = 189239616.

The previous prime is 189289097. The next prime is 189289123. The reversal of 189289109 is 901982981.

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 129458884 + 59830225 = 11378^2 + 7735^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189289109 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 (189282109) 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, 18482 + ... + 26835.

It is an arithmetic number, because the mean of its divisors is an integer number (47334651).

Almost surely, 2^189289109 is an apocalyptic number.

It is an amenable number.

189289109 is a deficient number, since it is larger than the sum of its proper divisors (49495).

189289109 is an equidigital number, since it uses as much as digits as its factorization.

189289109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49494.

The product of its (nonzero) digits is 93312, while the sum is 47.

The square root of 189289109 is about 13758.2378595516. The cubic root of 189289109 is about 574.1718224862.

The spelling of 189289109 in words is "one hundred eighty-nine million, two hundred eighty-nine thousand, one hundred nine".