505261 has 4 divisors (see below), whose sum is σ = 508000. Its totient is φ = 502524.

The previous prime is 505237. The next prime is 505277. The reversal of 505261 is 162505.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 505261 - 2¹¹ = 503213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505201) 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 in 3 ways as a sum of consecutive naturals, for example, 1071 + ... + 1468.

It is an arithmetic number, because the mean of its divisors is an integer number (127000).

2⁵⁰⁵²⁶¹ is an apocalyptic number.

It is an amenable number.

505261 is a deficient number, since it is larger than the sum of its proper divisors (2739).

505261 is a wasteful number, since it uses less digits than its factorization.

505261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2738.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 505261 is about 710.8171354153. The cubic root of 505261 is about 79.6474591355.

Multiplying 505261 by its sum of digits (19), we get a palindrome (9599959).

Adding to 505261 its reverse (162505), we get a palindrome (667766).

The spelling of 505261 in words is "five hundred five thousand, two hundred sixty-one".