609617509 has 2 divisors, whose sum is σ = 609617510. Its totient is φ = 609617508.

The previous prime is 609617447. The next prime is 609617537. The reversal of 609617509 is 905716906.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 586124100 + 23493409 = 24210^2 + 4847^2 .

It is a cyclic number.

It is not a de Polignac number, because 609617509 - 2¹⁵ = 609584741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (609617209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304808754 + 304808755.

It is an arithmetic number, because the mean of its divisors is an integer number (304808755).

Almost surely, 2^609617509 is an apocalyptic number.

It is an amenable number.

609617509 is a deficient number, since it is larger than the sum of its proper divisors (1).

609617509 is an equidigital number, since it uses as much as digits as its factorization.

609617509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 609617509 is about 24690.4335522890. The cubic root of 609617509 is about 847.9153106988.

The spelling of 609617509 in words is "six hundred nine million, six hundred seventeen thousand, five hundred nine".