111228391 has 8 divisors (see below), whose sum is σ = 116532864. Its totient is φ = 105963000.

The previous prime is 111228389. The next prime is 111228431. The reversal of 111228391 is 193822111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111228391 - 2¹ = 111228389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111228791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3861 + ... + 15406.

It is an arithmetic number, because the mean of its divisors is an integer number (14566608).

Almost surely, 2^111228391 is an apocalyptic number.

111228391 is a deficient number, since it is larger than the sum of its proper divisors (5304473).

111228391 is a wasteful number, since it uses less digits than its factorization.

111228391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19541.

The product of its digits is 864, while the sum is 28.

The square root of 111228391 is about 10546.4871402757. The cubic root of 111228391 is about 480.9189441608.

The spelling of 111228391 in words is "one hundred eleven million, two hundred twenty-eight thousand, three hundred ninety-one".