111928321 has 4 divisors (see below), whose sum is σ = 115538944. Its totient is φ = 108317700.

The previous prime is 111928279. The next prime is 111928337. The reversal of 111928321 is 123829111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111928321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111928321.

It is not an unprimeable number, because it can be changed into a prime (111928361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1805265 + ... + 1805326.

It is an arithmetic number, because the mean of its divisors is an integer number (28884736).

Almost surely, 2^111928321 is an apocalyptic number.

It is an amenable number.

111928321 is a deficient number, since it is larger than the sum of its proper divisors (3610623).

111928321 is an equidigital number, since it uses as much as digits as its factorization.

111928321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3610622.

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

The square root of 111928321 is about 10579.6181878176. The cubic root of 111928321 is about 481.9255995882.

The spelling of 111928321 in words is "one hundred eleven million, nine hundred twenty-eight thousand, three hundred twenty-one".