520561885 has 4 divisors (see below), whose sum is σ = 624674268. Its totient is φ = 416449504.

The previous prime is 520561831. The next prime is 520561891. The reversal of 520561885 is 588165025.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 250715556 + 269846329 = 15834^2 + 16427^2 .

It is a cyclic number.

It is not a de Polignac number, because 520561885 - 2⁷ = 520561757 is a prime.

It is a super-2 number, since 2×520561885² = 541969352229506450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52056184 + ... + 52056193.

It is an arithmetic number, because the mean of its divisors is an integer number (156168567).

Almost surely, 2^520561885 is an apocalyptic number.

It is an amenable number.

520561885 is a deficient number, since it is larger than the sum of its proper divisors (104112383).

520561885 is a wasteful number, since it uses less digits than its factorization.

520561885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104112382.

The product of its (nonzero) digits is 96000, while the sum is 40.

The square root of 520561885 is about 22815.8253192822. The cubic root of 520561885 is about 804.4346866231.

The spelling of 520561885 in words is "five hundred twenty million, five hundred sixty-one thousand, eight hundred eighty-five".