520543405 has 4 divisors (see below), whose sum is σ = 624652092. Its totient is φ = 416434720.

The previous prime is 520543379. The next prime is 520543483. The reversal of 520543405 is 504345025.

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 378146916 + 142396489 = 19446^2 + 11933^2 .

It is not a de Polignac number, because 520543405 - 2¹⁵ = 520510637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52054336 + ... + 52054345.

It is an arithmetic number, because the mean of its divisors is an integer number (156163023).

Almost surely, 2^520543405 is an apocalyptic number.

It is an amenable number.

520543405 is a deficient number, since it is larger than the sum of its proper divisors (104108687).

520543405 is a wasteful number, since it uses less digits than its factorization.

520543405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104108686.

The product of its (nonzero) digits is 12000, while the sum is 28.

The square root of 520543405 is about 22815.4203336252. The cubic root of 520543405 is about 804.4251673393.

The spelling of 520543405 in words is "five hundred twenty million, five hundred forty-three thousand, four hundred five".