612513509 has 2 divisors, whose sum is σ = 612513510. Its totient is φ = 612513508.

The previous prime is 612513493. The next prime is 612513533. The reversal of 612513509 is 905315216.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396129409 + 216384100 = 19903^2 + 14710^2 .

It is a cyclic number.

It is not a de Polignac number, because 612513509 - 2⁴ = 612513493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612513569) 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, 306256754 + 306256755.

It is an arithmetic number, because the mean of its divisors is an integer number (306256755).

Almost surely, 2^612513509 is an apocalyptic number.

It is an amenable number.

612513509 is a deficient number, since it is larger than the sum of its proper divisors (1).

612513509 is an equidigital number, since it uses as much as digits as its factorization.

612513509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 612513509 is about 24749.0102630388. The cubic root of 612513509 is about 849.2558696196.

The spelling of 612513509 in words is "six hundred twelve million, five hundred thirteen thousand, five hundred nine".