513251209 has 2 divisors, whose sum is σ = 513251210. Its totient is φ = 513251208.

The previous prime is 513251203. The next prime is 513251231. The reversal of 513251209 is 902152315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 312405625 + 200845584 = 17675^2 + 14172^2 .

It is a cyclic number.

It is not a de Polignac number, because 513251209 - 2³ = 513251201 is a prime.

It is not a weakly prime, because it can be changed into another prime (513251201) 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, 256625604 + 256625605.

It is an arithmetic number, because the mean of its divisors is an integer number (256625605).

Almost surely, 2^513251209 is an apocalyptic number.

It is an amenable number.

513251209 is a deficient number, since it is larger than the sum of its proper divisors (1).

513251209 is an equidigital number, since it uses as much as digits as its factorization.

513251209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 513251209 is about 22655.0482012288. The cubic root of 513251209 is about 800.6511412293.

The spelling of 513251209 in words is "five hundred thirteen million, two hundred fifty-one thousand, two hundred nine".