189331309 has 4 divisors (see below), whose sum is σ = 189387004. Its totient is φ = 189275616.

The previous prime is 189331301. The next prime is 189331313. The reversal of 189331309 is 903133981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 903133981 = 2153 ⋅419477.

It can be written as a sum of positive squares in 2 ways, for example, as 57426084 + 131905225 = 7578^2 + 11485^2 .

It is a cyclic number.

It is not a de Polignac number, because 189331309 - 2³ = 189331301 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 (189331301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22392 + ... + 29665.

It is an arithmetic number, because the mean of its divisors is an integer number (47346751).

Almost surely, 2^189331309 is an apocalyptic number.

It is an amenable number.

189331309 is a deficient number, since it is larger than the sum of its proper divisors (55695).

189331309 is an equidigital number, since it uses as much as digits as its factorization.

189331309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55694.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 189331309 is about 13759.7714007174. The cubic root of 189331309 is about 574.2144878226.

The spelling of 189331309 in words is "one hundred eighty-nine million, three hundred thirty-one thousand, three hundred nine".