111145520 has 20 divisors (see below), whose sum is σ = 258413520. Its totient is φ = 44458176.

The previous prime is 111145519. The next prime is 111145543. The reversal of 111145520 is 25541111.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 111145492 and 111145501.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 694580 + ... + 694739.

It is an arithmetic number, because the mean of its divisors is an integer number (12920676).

Almost surely, 2^111145520 is an apocalyptic number.

111145520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111145520 is an abundant number, since it is smaller than the sum of its proper divisors (147268000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111145520 is a wasteful number, since it uses less digits than its factorization.

111145520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389332 (or 1389326 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 111145520 is about 10542.5575644622. The cubic root of 111145520 is about 480.7994778525.

Adding to 111145520 its reverse (25541111), we get a palindrome (136686631).

The spelling of 111145520 in words is "one hundred eleven million, one hundred forty-five thousand, five hundred twenty".