521265 has 32 divisors (see below), whose sum is σ = 921600. Its totient is φ = 250560.

The previous prime is 521251. The next prime is 521267. The reversal of 521265 is 562125.

It is not a de Polignac number, because 521265 - 2⁶ = 521201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8806 + ... + 8864.

It is an arithmetic number, because the mean of its divisors is an integer number (28800).

2⁵²¹²⁶⁵ is an apocalyptic number.

It is an amenable number.

521265 is a deficient number, since it is larger than the sum of its proper divisors (400335).

521265 is a wasteful number, since it uses less digits than its factorization.

521265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117.

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

The square root of 521265 is about 721.9868419854. The cubic root of 521265 is about 80.4796702904.

The spelling of 521265 in words is "five hundred twenty-one thousand, two hundred sixty-five".