189015209 has 2 divisors, whose sum is σ = 189015210. Its totient is φ = 189015208.

The previous prime is 189015199. The next prime is 189015217. The reversal of 189015209 is 902510981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94633984 + 94381225 = 9728^2 + 9715^2 .

It is an emirp because it is prime and its reverse (902510981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189015209 - 2⁴ = 189015193 is a prime.

It is not a weakly prime, because it can be changed into another prime (189011209) 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, 94507604 + 94507605.

It is an arithmetic number, because the mean of its divisors is an integer number (94507605).

Almost surely, 2^189015209 is an apocalyptic number.

It is an amenable number.

189015209 is a deficient number, since it is larger than the sum of its proper divisors (1).

189015209 is an equidigital number, since it uses as much as digits as its factorization.

189015209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 189015209 is about 13748.2802197220. The cubic root of 189015209 is about 573.8947479481.

The spelling of 189015209 in words is "one hundred eighty-nine million, fifteen thousand, two hundred nine".