189507139 has 2 divisors, whose sum is σ = 189507140. Its totient is φ = 189507138.

The previous prime is 189507137. The next prime is 189507161. The reversal of 189507139 is 931705981.

189507139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189507139 - 2¹ = 189507137 is a prime.

Together with 189507137, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 189507095 and 189507104.

It is not a weakly prime, because it can be changed into another prime (189507133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94753569 + 94753570.

It is an arithmetic number, because the mean of its divisors is an integer number (94753570).

Almost surely, 2^189507139 is an apocalyptic number.

189507139 is a deficient number, since it is larger than the sum of its proper divisors (1).

189507139 is an equidigital number, since it uses as much as digits as its factorization.

189507139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 189507139 is about 13766.1591956508. The cubic root of 189507139 is about 574.3921884808.

The spelling of 189507139 in words is "one hundred eighty-nine million, five hundred seven thousand, one hundred thirty-nine".