512213509 has 2 divisors, whose sum is σ = 512213510. Its totient is φ = 512213508.

The previous prime is 512213503. The next prime is 512213551. The reversal of 512213509 is 905312215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 434597409 + 77616100 = 20847^2 + 8810^2 .

It is a cyclic number.

It is not a de Polignac number, because 512213509 - 2⁵ = 512213477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (512213503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256106754 + 256106755.

It is an arithmetic number, because the mean of its divisors is an integer number (256106755).

Almost surely, 2^512213509 is an apocalyptic number.

It is an amenable number.

512213509 is a deficient number, since it is larger than the sum of its proper divisors (1).

512213509 is an equidigital number, since it uses as much as digits as its factorization.

512213509 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 512213509 is about 22632.1344331462. The cubic root of 512213509 is about 800.1111871502. Note that the first 4 decimals are identical.

The spelling of 512213509 in words is "five hundred twelve million, two hundred thirteen thousand, five hundred nine".