520240111 has 4 divisors (see below), whose sum is σ = 529057800. Its totient is φ = 511422424.

The previous prime is 520240093. The next prime is 520240141. The reversal of 520240111 is 111042025.

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

It is a cyclic number.

It is not a de Polignac number, because 520240111 - 2⁵ = 520240079 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 (520240141) 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, 4408756 + ... + 4408873.

It is an arithmetic number, because the mean of its divisors is an integer number (132264450).

Almost surely, 2^520240111 is an apocalyptic number.

520240111 is a deficient number, since it is larger than the sum of its proper divisors (8817689).

520240111 is an equidigital number, since it uses as much as digits as its factorization.

520240111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8817688.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 520240111 is about 22808.7726763191. The cubic root of 520240111 is about 804.2689045288.

Adding to 520240111 its reverse (111042025), we get a palindrome (631282136).

The spelling of 520240111 in words is "five hundred twenty million, two hundred forty thousand, one hundred eleven".