1288111 has 4 divisors (see below), whose sum is σ = 1405224. Its totient is φ = 1171000.

The previous prime is 1288109. The next prime is 1288117. The reversal of 1288111 is 1118821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1288111 - 2¹ = 1288109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58540 + ... + 58561.

It is an arithmetic number, because the mean of its divisors is an integer number (351306).

2^1288111 is an apocalyptic number.

1288111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1288111 is a deficient number, since it is larger than the sum of its proper divisors (117113).

1288111 is a wasteful number, since it uses less digits than its factorization.

1288111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117112.

The product of its digits is 128, while the sum is 22.

The square root of 1288111 is about 1134.9497786246. The cubic root of 1288111 is about 108.8055619543.

The spelling of 1288111 in words is "one million, two hundred eighty-eight thousand, one hundred eleven".