505669 has 2 divisors, whose sum is σ = 505670. Its totient is φ = 505668.

The previous prime is 505663. The next prime is 505691. The reversal of 505669 is 966505.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 289444 + 216225 = 538^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 505669 - 2⁹ = 505157 is a prime.

It is a super-2 number, since 2×505669² = 511402275122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 505669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252834 + 252835.

It is an arithmetic number, because the mean of its divisors is an integer number (252835).

2⁵⁰⁵⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

505669 is a deficient number, since it is larger than the sum of its proper divisors (1).

505669 is an equidigital number, since it uses as much as digits as its factorization.

505669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 505669 is about 711.1040711457. The cubic root of 505669 is about 79.6688919001.

The spelling of 505669 in words is "five hundred five thousand, six hundred sixty-nine".