189558913 has 2 divisors, whose sum is σ = 189558914. Its totient is φ = 189558912.

The previous prime is 189558911. The next prime is 189558977. The reversal of 189558913 is 319855981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189557824 + 1089 = 13768^2 + 33^2 .

It is an emirp because it is prime and its reverse (319855981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189558913 - 2¹ = 189558911 is a prime.

Together with 189558911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (189558911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94779456 + 94779457.

It is an arithmetic number, because the mean of its divisors is an integer number (94779457).

Almost surely, 2^189558913 is an apocalyptic number.

It is an amenable number.

189558913 is a deficient number, since it is larger than the sum of its proper divisors (1).

189558913 is an equidigital number, since it uses as much as digits as its factorization.

189558913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 49.

The square root of 189558913 is about 13768.0395481710. The cubic root of 189558913 is about 574.4444923562. Note that the first 4 decimals are identical.

The spelling of 189558913 in words is "one hundred eighty-nine million, five hundred fifty-eight thousand, nine hundred thirteen".