111391820 has 48 divisors (see below), whose sum is σ = 249570720. Its totient is φ = 41616384.

The previous prime is 111391807. The next prime is 111391853. The reversal of 111391820 is 28193111.

It is a self number, because there is not a number n which added to its sum of digits gives 111391820.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46082 + ... + 48438.

It is an arithmetic number, because the mean of its divisors is an integer number (5199390).

Almost surely, 2^111391820 is an apocalyptic number.

111391820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111391820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124785360).

111391820 is an abundant number, since it is smaller than the sum of its proper divisors (138178900).

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

111391820 is a wasteful number, since it uses less digits than its factorization.

111391820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522 (or 2520 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 111391820 is about 10554.2323264177. The cubic root of 111391820 is about 481.1543685843.

It can be divided in two parts, 111391 and 820, that added together give a palindrome (112211).

The spelling of 111391820 in words is "one hundred eleven million, three hundred ninety-one thousand, eight hundred twenty".