189913 has 2 divisors, whose sum is σ = 189914. Its totient is φ = 189912.

The previous prime is 189901. The next prime is 189929. The reversal of 189913 is 319981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138384 + 51529 = 372^2 + 227^2 .

It is an emirp because it is prime and its reverse (319981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189913 - 2⁵ = 189881 is a prime.

189913 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (189983) 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, 94956 + 94957.

It is an arithmetic number, because the mean of its divisors is an integer number (94957).

2¹⁸⁹⁹¹³ is an apocalyptic number.

It is an amenable number.

189913 is a deficient number, since it is larger than the sum of its proper divisors (1).

189913 is an equidigital number, since it uses as much as digits as its factorization.

189913 is an odious number, because the sum of its binary digits is odd.

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

The square root of 189913 is about 435.7900870832. The cubic root of 189913 is about 57.4801948174.

The spelling of 189913 in words is "one hundred eighty-nine thousand, nine hundred thirteen".