113891 has 2 divisors, whose sum is σ = 113892. Its totient is φ = 113890.

The previous prime is 113843. The next prime is 113899. The reversal of 113891 is 198311.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113891 is a prime.

It is a Chen prime.

It is equal to p₁₀₇₇₈ and since 113891 and 10778 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (113899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56945 + 56946.

It is an arithmetic number, because the mean of its divisors is an integer number (56946).

2¹¹³⁸⁹¹ is an apocalyptic number.

113891 is a deficient number, since it is larger than the sum of its proper divisors (1).

113891 is an equidigital number, since it uses as much as digits as its factorization.

113891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 23.

The square root of 113891 is about 337.4774066512. The cubic root of 113891 is about 48.4726171285.

The spelling of 113891 in words is "one hundred thirteen thousand, eight hundred ninety-one".