111544921 has 4 divisors (see below), whose sum is σ = 111654144. Its totient is φ = 111435700.

The previous prime is 111544903. The next prime is 111544981. The reversal of 111544921 is 129445111.

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 not a de Polignac number, because 111544921 - 2⁷ = 111544793 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 111544921.

It is not an unprimeable number, because it can be changed into a prime (111544981) 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, 53065 + ... + 55126.

It is an arithmetic number, because the mean of its divisors is an integer number (27913536).

Almost surely, 2^111544921 is an apocalyptic number.

It is an amenable number.

111544921 is a deficient number, since it is larger than the sum of its proper divisors (109223).

111544921 is a wasteful number, since it uses less digits than its factorization.

111544921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109222.

The product of its digits is 1440, while the sum is 28.

The square root of 111544921 is about 10561.4828977753. The cubic root of 111544921 is about 481.3747064013.

The spelling of 111544921 in words is "one hundred eleven million, five hundred forty-four thousand, nine hundred twenty-one".