189331 has 4 divisors (see below), whose sum is σ = 192600. Its totient is φ = 186064.

The previous prime is 189311. The next prime is 189337. The reversal of 189331 is 133981.

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-189331 is a prime.

It is a super-2 number, since 2×189331² = 71692455122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

189331 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 189296 and 189305.

It is not an unprimeable number, because it can be changed into a prime (189337) 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, 1546 + ... + 1663.

It is an arithmetic number, because the mean of its divisors is an integer number (48150).

2¹⁸⁹³³¹ is an apocalyptic number.

189331 is a deficient number, since it is larger than the sum of its proper divisors (3269).

189331 is an equidigital number, since it uses as much as digits as its factorization.

189331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3268.

The product of its digits is 648, while the sum is 25.

The square root of 189331 is about 435.1218220223. The cubic root of 189331 is about 57.4214175438.

The spelling of 189331 in words is "one hundred eighty-nine thousand, three hundred thirty-one".