520779521 has 4 divisors (see below), whose sum is σ = 524228544. Its totient is φ = 517330500.

The previous prime is 520779503. The next prime is 520779529. The reversal of 520779521 is 125977025.

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 not a de Polignac number, because 520779521 - 2¹⁴ = 520763137 is a prime.

It is a super-2 number, since 2×520779521² = 542422618985978882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520779529) 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, 1724285 + ... + 1724586.

It is an arithmetic number, because the mean of its divisors is an integer number (131057136).

Almost surely, 2^520779521 is an apocalyptic number.

It is an amenable number.

520779521 is a deficient number, since it is larger than the sum of its proper divisors (3449023).

520779521 is a wasteful number, since it uses less digits than its factorization.

520779521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3449022.

The product of its (nonzero) digits is 44100, while the sum is 38.

The square root of 520779521 is about 22820.5942297741. The cubic root of 520779521 is about 804.5467767575.

The spelling of 520779521 in words is "five hundred twenty million, seven hundred seventy-nine thousand, five hundred twenty-one".