111431320 has 256 divisors, whose sum is σ = 354170880. Its totient is φ = 30666240.

The previous prime is 111431303. The next prime is 111431321. The reversal of 111431320 is 23134111.

It is a junction number, because it is equal to n+sod(n) for n = 111431294 and 111431303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111431321) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4844829 + ... + 4844851.

It is an arithmetic number, because the mean of its divisors is an integer number (1383480).

Almost surely, 2^111431320 is an apocalyptic number.

111431320 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 111431320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177085440).

111431320 is an abundant number, since it is smaller than the sum of its proper divisors (242739560).

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

111431320 is a wasteful number, since it uses less digits than its factorization.

111431320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 111431320 is about 10556.1034477690. The cubic root of 111431320 is about 481.2112349728.

Adding to 111431320 its reverse (23134111), we get a palindrome (134565431).

The spelling of 111431320 in words is "one hundred eleven million, four hundred thirty-one thousand, three hundred twenty".