521263 has 4 divisors (see below), whose sum is σ = 523008. Its totient is φ = 519520.

The previous prime is 521251. The next prime is 521267. The reversal of 521263 is 362125.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 521263 - 2⁵ = 521231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521263.

It is a congruent number.

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298 + ... + 1063.

It is an arithmetic number, because the mean of its divisors is an integer number (130752).

2⁵²¹²⁶³ is an apocalyptic number.

521263 is a deficient number, since it is larger than the sum of its proper divisors (1745).

521263 is a wasteful number, since it uses less digits than its factorization.

521263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1744.

The product of its digits is 360, while the sum is 19.

The square root of 521263 is about 721.9854569172. The cubic root of 521263 is about 80.4795673615.

Adding to 521263 its reverse (362125), we get a palindrome (883388).

It can be divided in two parts, 521 and 263, that added together give a square (784 = 28²).

The spelling of 521263 in words is "five hundred twenty-one thousand, two hundred sixty-three".