505969 has 2 divisors, whose sum is σ = 505970. Its totient is φ = 505968.

The previous prime is 505961. The next prime is 505979. The reversal of 505969 is 969505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 291600 + 214369 = 540^2 + 463^2 .

It is a cyclic number.

It is not a de Polignac number, because 505969 - 2³ = 505961 is a prime.

It is a super-2 number, since 2×505969² = 512009257922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (505961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252984 + 252985.

It is an arithmetic number, because the mean of its divisors is an integer number (252985).

2⁵⁰⁵⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

505969 is a deficient number, since it is larger than the sum of its proper divisors (1).

505969 is an equidigital number, since it uses as much as digits as its factorization.

505969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 505969 is about 711.3149794571. The cubic root of 505969 is about 79.6846439320.

It can be divided in two parts, 50596 and 9, that added together give a palindrome (50605).

The spelling of 505969 in words is "five hundred five thousand, nine hundred sixty-nine".