185147009 has 2 divisors, whose sum is σ = 185147010. Its totient is φ = 185147008.

The previous prime is 185146999. The next prime is 185147029. The reversal of 185147009 is 900741581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159946609 + 25200400 = 12647^2 + 5020^2 .

It is an emirp because it is prime and its reverse (900741581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 185147009 - 2¹² = 185142913 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 185147009.

It is not a weakly prime, because it can be changed into another prime (185147029) 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, 92573504 + 92573505.

It is an arithmetic number, because the mean of its divisors is an integer number (92573505).

Almost surely, 2^185147009 is an apocalyptic number.

It is an amenable number.

185147009 is a deficient number, since it is larger than the sum of its proper divisors (1).

185147009 is an equidigital number, since it uses as much as digits as its factorization.

185147009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 185147009 is about 13606.8735938863. The cubic root of 185147009 is about 569.9528113187.

The spelling of 185147009 in words is "one hundred eighty-five million, one hundred forty-seven thousand, nine".