509705279 has 2 divisors, whose sum is σ = 509705280. Its totient is φ = 509705278.

The previous prime is 509705269. The next prime is 509705281. The reversal of 509705279 is 972507905.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 509705279 - 2⁴ = 509705263 is a prime.

Together with 509705281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509705269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254852639 + 254852640.

It is an arithmetic number, because the mean of its divisors is an integer number (254852640).

Almost surely, 2^509705279 is an apocalyptic number.

509705279 is a deficient number, since it is larger than the sum of its proper divisors (1).

509705279 is an equidigital number, since it uses as much as digits as its factorization.

509705279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 198450, while the sum is 44.

The square root of 509705279 is about 22576.6534056755. The cubic root of 509705279 is about 798.8030428226.

The spelling of 509705279 in words is "five hundred nine million, seven hundred five thousand, two hundred seventy-nine".