111818281 has 2 divisors, whose sum is σ = 111818282. Its totient is φ = 111818280.

The previous prime is 111818279. The next prime is 111818297. The reversal of 111818281 is 182818111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111112681 + 705600 = 10541^2 + 840^2 .

It is a cyclic number.

It is not a de Polignac number, because 111818281 - 2¹ = 111818279 is a prime.

It is a super-2 number, since 2×111818281² = 25006655931589922, which contains 22 as substring.

Together with 111818279, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111818381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55909140 + 55909141.

It is an arithmetic number, because the mean of its divisors is an integer number (55909141).

Almost surely, 2^111818281 is an apocalyptic number.

It is an amenable number.

111818281 is a deficient number, since it is larger than the sum of its proper divisors (1).

111818281 is an equidigital number, since it uses as much as digits as its factorization.

111818281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1024, while the sum is 31.

The square root of 111818281 is about 10574.4163432314. The cubic root of 111818281 is about 481.7676160954.

The spelling of 111818281 in words is "one hundred eleven million, eight hundred eighteen thousand, two hundred eighty-one".