520669 has 4 divisors (see below), whose sum is σ = 522144. Its totient is φ = 519196.

The previous prime is 520649. The next prime is 520679. The reversal of 520669 is 966025.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 520669 - 2¹¹ = 518621 is a prime.

It is a super-2 number, since 2×520669² = 542192415122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520609) 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, 144 + ... + 1030.

It is an arithmetic number, because the mean of its divisors is an integer number (130536).

2⁵²⁰⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

520669 is a deficient number, since it is larger than the sum of its proper divisors (1475).

520669 is an equidigital number, since it uses as much as digits as its factorization.

520669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 520669 is about 721.5739740318. The cubic root of 520669 is about 80.4489858489.

The spelling of 520669 in words is "five hundred twenty thousand, six hundred sixty-nine".