111491 has 2 divisors, whose sum is σ = 111492. Its totient is φ = 111490.

The previous prime is 111487. The next prime is 111493. The reversal of 111491 is 194111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111491 - 2² = 111487 is a prime.

Together with 111493, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₁₀₅₇₄ and since 111491 and 10574 have the same sum of digits, it is a Honaker prime.

It is a zygodrome in base 6.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 111491.

It is not a weakly prime, because it can be changed into another prime (111493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55745 + 55746.

It is an arithmetic number, because the mean of its divisors is an integer number (55746).

2¹¹¹⁴⁹¹ is an apocalyptic number.

111491 is a deficient number, since it is larger than the sum of its proper divisors (1).

111491 is an equidigital number, since it uses as much as digits as its factorization.

111491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 17.

The square root of 111491 is about 333.9026804325. The cubic root of 111491 is about 48.1297128122.

The spelling of 111491 in words is "one hundred eleven thousand, four hundred ninety-one".