520120111 has 24 divisors (see below), whose sum is σ = 616053600. Its totient is φ = 429990912.

The previous prime is 520120093. The next prime is 520120127. The reversal of 520120111 is 111021025.

It is not a de Polignac number, because 520120111 - 2¹³ = 520111919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520120091 and 520120100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520120141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3490665 + ... + 3490813.

It is an arithmetic number, because the mean of its divisors is an integer number (25668900).

Almost surely, 2^520120111 is an apocalyptic number.

520120111 is a deficient number, since it is larger than the sum of its proper divisors (95933489).

520120111 is an equidigital number, since it uses as much as digits as its factorization.

520120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 520120111 is about 22806.1419578148. The cubic root of 520120111 is about 804.2070614887.

Adding to 520120111 its reverse (111021025), we get a palindrome (631141136).

The spelling of 520120111 in words is "five hundred twenty million, one hundred twenty thousand, one hundred eleven".