111191420928 has 156 divisors (see below), whose sum is σ = 344880089160. Its totient is φ = 31768805376.

The previous prime is 111191420891. The next prime is 111191420929. The reversal of 111191420928 is 829024191111.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111191420929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 509778 + ... + 694446.

Almost surely, 2^111191420928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111191420928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172440044580).

111191420928 is an abundant number, since it is smaller than the sum of its proper divisors (233688668232).

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

111191420928 is an equidigital number, since it uses as much as digits as its factorization.

111191420928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184710 (or 184681 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 39.

The spelling of 111191420928 in words is "one hundred eleven billion, one hundred ninety-one million, four hundred twenty thousand, nine hundred twenty-eight".