520993 has 4 divisors (see below), whose sum is σ = 568368. Its totient is φ = 473620.

The previous prime is 520981. The next prime is 521009. The reversal of 520993 is 399025.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520913) 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, 23671 + ... + 23692.

It is an arithmetic number, because the mean of its divisors is an integer number (142092).

2⁵²⁰⁹⁹³ is an apocalyptic number.

It is an amenable number.

520993 is a deficient number, since it is larger than the sum of its proper divisors (47375).

520993 is a wasteful number, since it uses less digits than its factorization.

520993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47374.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 520993 is about 721.7984483220. The cubic root of 520993 is about 80.4656695556.

The spelling of 520993 in words is "five hundred twenty thousand, nine hundred ninety-three".