609779 has 2 divisors, whose sum is σ = 609780. Its totient is φ = 609778.

The previous prime is 609757. The next prime is 609781. The reversal of 609779 is 977906.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-609779 is a prime.

Together with 609781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (609709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304889 + 304890.

It is an arithmetic number, because the mean of its divisors is an integer number (304890).

2⁶⁰⁹⁷⁷⁹ is an apocalyptic number.

609779 is a deficient number, since it is larger than the sum of its proper divisors (1).

609779 is an equidigital number, since it uses as much as digits as its factorization.

609779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 609779 is about 780.8834740216. The cubic root of 609779 is about 84.7990176550.

The spelling of 609779 in words is "six hundred nine thousand, seven hundred seventy-nine".