517397509 has 2 divisors, whose sum is σ = 517397510. Its totient is φ = 517397508.

The previous prime is 517397453. The next prime is 517397521. The reversal of 517397509 is 905793715.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 478646884 + 38750625 = 21878^2 + 6225^2 .

It is a cyclic number.

It is not a de Polignac number, because 517397509 - 2¹³ = 517389317 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 (517397539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258698754 + 258698755.

It is an arithmetic number, because the mean of its divisors is an integer number (258698755).

Almost surely, 2^517397509 is an apocalyptic number.

It is an amenable number.

517397509 is a deficient number, since it is larger than the sum of its proper divisors (1).

517397509 is an equidigital number, since it uses as much as digits as its factorization.

517397509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 297675, while the sum is 46.

The square root of 517397509 is about 22746.3735351374. The cubic root of 517397509 is about 802.8013814811.

The spelling of 517397509 in words is "five hundred seventeen million, three hundred ninety-seven thousand, five hundred nine".