505279 has 2 divisors, whose sum is σ = 505280. Its totient is φ = 505278.

The previous prime is 505277. The next prime is 505283. The reversal of 505279 is 972505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505279 - 2¹ = 505277 is a prime.

Together with 505277, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252639 + 252640.

It is an arithmetic number, because the mean of its divisors is an integer number (252640).

2⁵⁰⁵²⁷⁹ is an apocalyptic number.

505279 is a deficient number, since it is larger than the sum of its proper divisors (1).

505279 is an equidigital number, since it uses as much as digits as its factorization.

505279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3150, while the sum is 28.

The square root of 505279 is about 710.8297967868. The cubic root of 505279 is about 79.6484049418.

It can be divided in two parts, 505 and 279, that added together give a square (784 = 28²).

The spelling of 505279 in words is "five hundred five thousand, two hundred seventy-nine".