265521 has 8 divisors (see below), whose sum is σ = 359584. Its totient is φ = 174240.

The previous prime is 265513. The next prime is 265541. The reversal of 265521 is 125562.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 265521 - 2³ = 265513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 265521.

It is not an unprimeable number, because it can be changed into a prime (265511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460 + ... + 861.

It is an arithmetic number, because the mean of its divisors is an integer number (44948).

2²⁶⁵⁵²¹ is an apocalyptic number.

It is an amenable number.

265521 is a deficient number, since it is larger than the sum of its proper divisors (94063).

265521 is a wasteful number, since it uses less digits than its factorization.

265521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391.

The product of its digits is 600, while the sum is 21.

The square root of 265521 is about 515.2872985044. The cubic root of 265521 is about 64.2736492349.

It can be divided in two parts, 2655 and 21, that multiplied together give a palindrome (55755).

The spelling of 265521 in words is "two hundred sixty-five thousand, five hundred twenty-one".