189494009 has 2 divisors, whose sum is σ = 189494010. Its totient is φ = 189494008.

The previous prime is 189494003. The next prime is 189494021. The reversal of 189494009 is 900494981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113316025 + 76177984 = 10645^2 + 8728^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189494009 is a prime.

It is not a weakly prime, because it can be changed into another prime (189494003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94747004 + 94747005.

It is an arithmetic number, because the mean of its divisors is an integer number (94747005).

Almost surely, 2^189494009 is an apocalyptic number.

It is an amenable number.

189494009 is a deficient number, since it is larger than the sum of its proper divisors (1).

189494009 is an equidigital number, since it uses as much as digits as its factorization.

189494009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 189494009 is about 13765.6822932973. The cubic root of 189494009 is about 574.3789225890.

The spelling of 189494009 in words is "one hundred eighty-nine million, four hundred ninety-four thousand, nine".