189896909 has 2 divisors, whose sum is σ = 189896910. Its totient is φ = 189896908.

The previous prime is 189896893. The next prime is 189896921. The reversal of 189896909 is 909698981.

189896909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171217225 + 18679684 = 13085^2 + 4322^2 .

It is a cyclic number.

It is not a de Polignac number, because 189896909 - 2⁴ = 189896893 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189896939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94948454 + 94948455.

It is an arithmetic number, because the mean of its divisors is an integer number (94948455).

Almost surely, 2^189896909 is an apocalyptic number.

It is an amenable number.

189896909 is a deficient number, since it is larger than the sum of its proper divisors (1).

189896909 is an equidigital number, since it uses as much as digits as its factorization.

189896909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 59.

The square root of 189896909 is about 13780.3087410987. The cubic root of 189896909 is about 574.7857137243.

The spelling of 189896909 in words is "one hundred eighty-nine million, eight hundred ninety-six thousand, nine hundred nine".