111901 has 4 divisors (see below), whose sum is σ = 112572. Its totient is φ = 111232.

The previous prime is 111893. The next prime is 111913. The reversal of 111901 is 109111.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 22500 + 89401 = 150^2 + 299^2 .

It is a cyclic number.

It is not a de Polignac number, because 111901 - 2³ = 111893 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 (111301) 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, 141 + ... + 493.

It is an arithmetic number, because the mean of its divisors is an integer number (28143).

2¹¹¹⁹⁰¹ is an apocalyptic number.

It is an amenable number.

111901 is a deficient number, since it is larger than the sum of its proper divisors (671).

111901 is an equidigital number, since it uses as much as digits as its factorization.

111901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670.

The product of its (nonzero) digits is 9, while the sum is 13.

The square root of 111901 is about 334.5160683734. The cubic root of 111901 is about 48.1886384727.

The spelling of 111901 in words is "one hundred eleven thousand, nine hundred one".