505979 has 2 divisors, whose sum is σ = 505980. Its totient is φ = 505978.

The previous prime is 505969. The next prime is 506047. The reversal of 505979 is 979505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505979 - 2¹⁶ = 440443 is a prime.

It is not a weakly prime, because it can be changed into another prime (505919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252989 + 252990.

It is an arithmetic number, because the mean of its divisors is an integer number (252990).

2⁵⁰⁵⁹⁷⁹ is an apocalyptic number.

505979 is a deficient number, since it is larger than the sum of its proper divisors (1).

505979 is an equidigital number, since it uses as much as digits as its factorization.

505979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14175, while the sum is 35.

The square root of 505979 is about 711.3220086571. The cubic root of 505979 is about 79.6851688925.

The spelling of 505979 in words is "five hundred five thousand, nine hundred seventy-nine".