520530397 has 4 divisors (see below), whose sum is σ = 524275360. Its totient is φ = 516785436.

The previous prime is 520530317. The next prime is 520530407. The reversal of 520530397 is 793035025.

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 520530397 - 2¹⁵ = 520497629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520530317) by changing a digit.

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, 1872273 + ... + 1872550.

It is an arithmetic number, because the mean of its divisors is an integer number (131068840).

Almost surely, 2^520530397 is an apocalyptic number.

It is an amenable number.

520530397 is a deficient number, since it is larger than the sum of its proper divisors (3744963).

520530397 is a wasteful number, since it uses less digits than its factorization.

520530397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3744962.

The product of its (nonzero) digits is 28350, while the sum is 34.

The square root of 520530397 is about 22815.1352614882. The cubic root of 520530397 is about 804.4184666175.

The spelling of 520530397 in words is "five hundred twenty million, five hundred thirty thousand, three hundred ninety-seven".