521283 has 16 divisors (see below), whose sum is σ = 805376. Its totient is φ = 293760.

The previous prime is 521281. The next prime is 521299. The reversal of 521283 is 382125.

It is a Cunningham number, because it is equal to 722²-1.

It is not a de Polignac number, because 521283 - 2¹ = 521281 is a prime.

It is a Smith number, since the sum of its digits (21) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521281) 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 15 ways as a sum of consecutive naturals, for example, 2043 + ... + 2283.

It is an arithmetic number, because the mean of its divisors is an integer number (50336).

2⁵²¹²⁸³ is an apocalyptic number.

521283 is a deficient number, since it is larger than the sum of its proper divisors (284093).

521283 is a wasteful number, since it uses less digits than its factorization.

521283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354.

The product of its digits is 480, while the sum is 21.

The square root of 521283 is about 721.9993074789. Note that the first 3 decimals coincide. The cubic root of 521283 is about 80.4805966377.

The spelling of 521283 in words is "five hundred twenty-one thousand, two hundred eighty-three".