505717 has 4 divisors (see below), whose sum is σ = 507276. Its totient is φ = 504160.

The previous prime is 505711. The next prime is 505727. The reversal of 505717 is 717505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 717505 = 5 ⋅143501.

It can be written as a sum of positive squares in 2 ways, for example, as 152881 + 352836 = 391^2 + 594^2 .

It is a cyclic number.

It is not a de Polignac number, because 505717 - 2³ = 505709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 505691 and 505700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88 + ... + 1009.

It is an arithmetic number, because the mean of its divisors is an integer number (126819).

2⁵⁰⁵⁷¹⁷ is an apocalyptic number.

It is an amenable number.

505717 is a deficient number, since it is larger than the sum of its proper divisors (1559).

505717 is a wasteful number, since it uses less digits than its factorization.

505717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558.

The product of its (nonzero) digits is 1225, while the sum is 25.

The square root of 505717 is about 711.1378206789. The cubic root of 505717 is about 79.6714126438.

The spelling of 505717 in words is "five hundred five thousand, seven hundred seventeen".