520423513 has 4 divisors (see below), whose sum is σ = 528955108. Its totient is φ = 511891920.

The previous prime is 520423489. The next prime is 520423549. The reversal of 520423513 is 315324025.

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 53993104 + 466430409 = 7348^2 + 21597^2 .

It is a cyclic number.

It is not a de Polignac number, because 520423513 - 2¹⁷ = 520292441 is a prime.

It is a super-2 number, since 2×520423513² = 541681265766522338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520423573) 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, 4265706 + ... + 4265827.

It is an arithmetic number, because the mean of its divisors is an integer number (132238777).

Almost surely, 2^520423513 is an apocalyptic number.

It is an amenable number.

520423513 is a deficient number, since it is larger than the sum of its proper divisors (8531595).

520423513 is an equidigital number, since it uses as much as digits as its factorization.

520423513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8531594.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 520423513 is about 22812.7927488065. The cubic root of 520423513 is about 804.3634039676.

Adding to 520423513 its reverse (315324025), we get a palindrome (835747538).

It can be divided in two parts, 52042 and 3513, that added together give a palindrome (55555).

The spelling of 520423513 in words is "five hundred twenty million, four hundred twenty-three thousand, five hundred thirteen".