111959 has 2 divisors, whose sum is σ = 111960. Its totient is φ = 111958.

The previous prime is 111953. The next prime is 111973. The reversal of 111959 is 959111.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111959 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111953) 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, 55979 + 55980.

It is an arithmetic number, because the mean of its divisors is an integer number (55980).

2¹¹¹⁹⁵⁹ is an apocalyptic number.

111959 is a deficient number, since it is larger than the sum of its proper divisors (1).

111959 is an equidigital number, since it uses as much as digits as its factorization.

111959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 405, while the sum is 26.

The square root of 111959 is about 334.6027495404. The cubic root of 111959 is about 48.1969626708.

The spelling of 111959 in words is "one hundred eleven thousand, nine hundred fifty-nine".