189139 has 2 divisors, whose sum is σ = 189140. Its totient is φ = 189138.

The previous prime is 189127. The next prime is 189149. The reversal of 189139 is 931981.

It is a strong prime.

It is an emirp because it is prime and its reverse (931981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189139 - 2⁷ = 189011 is a prime.

It is a super-2 number, since 2×189139² = 71547122642, which contains 22 as substring.

189139 is a lucky number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 189139.

It is not a weakly prime, because it can be changed into another prime (189149) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94569 + 94570.

It is an arithmetic number, because the mean of its divisors is an integer number (94570).

2¹⁸⁹¹³⁹ is an apocalyptic number.

189139 is a deficient number, since it is larger than the sum of its proper divisors (1).

189139 is an equidigital number, since it uses as much as digits as its factorization.

189139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 31.

The square root of 189139 is about 434.9011381912. The cubic root of 189139 is about 57.4020006830.

The spelling of 189139 in words is "one hundred eighty-nine thousand, one hundred thirty-nine".