521481 has 4 divisors (see below), whose sum is σ = 695312. Its totient is φ = 347652.

The previous prime is 521471. The next prime is 521483. The reversal of 521481 is 184125.

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 not a de Polignac number, because 521481 - 2⁹ = 520969 is a prime.

It is a super-2 number, since 2×521481² = 543884866722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

521481 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (521483) 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 3 ways as a sum of consecutive naturals, for example, 86911 + ... + 86916.

It is an arithmetic number, because the mean of its divisors is an integer number (173828).

2⁵²¹⁴⁸¹ is an apocalyptic number.

It is an amenable number.

521481 is a deficient number, since it is larger than the sum of its proper divisors (173831).

521481 is a wasteful number, since it uses less digits than its factorization.

521481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173830.

The product of its digits is 320, while the sum is 21.

The square root of 521481 is about 722.1364137059. The cubic root of 521481 is about 80.4907850517.

The spelling of 521481 in words is "five hundred twenty-one thousand, four hundred eighty-one".