189491 has 2 divisors, whose sum is σ = 189492. Its totient is φ = 189490.

The previous prime is 189479. The next prime is 189493. The reversal of 189491 is 194981.

189491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (194981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189491 is a prime.

Together with 189493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94745 + 94746.

It is an arithmetic number, because the mean of its divisors is an integer number (94746).

2¹⁸⁹⁴⁹¹ is an apocalyptic number.

189491 is a deficient number, since it is larger than the sum of its proper divisors (1).

189491 is an equidigital number, since it uses as much as digits as its factorization.

189491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 32.

The square root of 189491 is about 435.3056397521. The cubic root of 189491 is about 57.4375882360.

The spelling of 189491 in words is "one hundred eighty-nine thousand, four hundred ninety-one".