189256909 has 2 divisors, whose sum is σ = 189256910. Its totient is φ = 189256908.

The previous prime is 189256901. The next prime is 189256913. The reversal of 189256909 is 909652981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170955625 + 18301284 = 13075^2 + 4278^2 .

It is an emirp because it is prime and its reverse (909652981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189256909 - 2³ = 189256901 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 (189256901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94628454 + 94628455.

It is an arithmetic number, because the mean of its divisors is an integer number (94628455).

Almost surely, 2^189256909 is an apocalyptic number.

It is an amenable number.

189256909 is a deficient number, since it is larger than the sum of its proper divisors (1).

189256909 is an equidigital number, since it uses as much as digits as its factorization.

189256909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 49.

The square root of 189256909 is about 13757.0676017820. The cubic root of 189256909 is about 574.1392631537.

The spelling of 189256909 in words is "one hundred eighty-nine million, two hundred fifty-six thousand, nine hundred nine".