505289 has 4 divisors (see below), whose sum is σ = 506880. Its totient is φ = 503700.

The previous prime is 505283. The next prime is 505301. The reversal of 505289 is 982505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 982505 = 5 ⋅196501.

It is a cyclic number.

It is not a de Polignac number, because 505289 - 2⁸ = 505033 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (505283) 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, 137 + ... + 1014.

It is an arithmetic number, because the mean of its divisors is an integer number (126720).

2⁵⁰⁵²⁸⁹ is an apocalyptic number.

It is an amenable number.

505289 is a deficient number, since it is larger than the sum of its proper divisors (1591).

505289 is a wasteful number, since it uses less digits than its factorization.

505289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1590.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 505289 is about 710.8368307847. The cubic root of 505289 is about 79.6489303801.

The spelling of 505289 in words is "five hundred five thousand, two hundred eighty-nine".