281428111 has 2 divisors, whose sum is σ = 281428112. Its totient is φ = 281428110.

The previous prime is 281428109. The next prime is 281428153. The reversal of 281428111 is 111824182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 281428111 - 2¹ = 281428109 is a prime.

It is a super-2 number, since 2×281428111² = 158403563322056642, which contains 22 as substring.

Together with 281428109, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 281428111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281428211) 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, 140714055 + 140714056.

It is an arithmetic number, because the mean of its divisors is an integer number (140714056).

Almost surely, 2^281428111 is an apocalyptic number.

281428111 is a deficient number, since it is larger than the sum of its proper divisors (1).

281428111 is an equidigital number, since it uses as much as digits as its factorization.

281428111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1024, while the sum is 28.

The square root of 281428111 is about 16775.8192348392. The cubic root of 281428111 is about 655.3236254025.

The spelling of 281428111 in words is "two hundred eighty-one million, four hundred twenty-eight thousand, one hundred eleven".