521959 has 4 divisors (see below), whose sum is σ = 536104. Its totient is φ = 507816.

The previous prime is 521929. The next prime is 521981. The reversal of 521959 is 959125.

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 521959 - 2⁷ = 521831 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 521959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7017 + ... + 7090.

It is an arithmetic number, because the mean of its divisors is an integer number (134026).

2⁵²¹⁹⁵⁹ is an apocalyptic number.

521959 is a deficient number, since it is larger than the sum of its proper divisors (14145).

521959 is a wasteful number, since it uses less digits than its factorization.

521959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14144.

The product of its digits is 4050, while the sum is 31.

The square root of 521959 is about 722.4673002981. The cubic root of 521959 is about 80.5153707002.

The spelling of 521959 in words is "five hundred twenty-one thousand, nine hundred fifty-nine".