1111999 has 8 divisors (see below), whose sum is σ = 1290368. Its totient is φ = 938520.

The previous prime is 1111991. The next prime is 1112003. The reversal of 1111999 is 9991111.

1111999 = 428² + 429² + ... + 433².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1111999 - 2³ = 1111991 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 1111999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 717 + ... + 1654.

It is an arithmetic number, because the mean of its divisors is an integer number (161296).

2^1111999 is an apocalyptic number.

1111999 is a deficient number, since it is larger than the sum of its proper divisors (178369).

1111999 is an equidigital number, since it uses as much as digits as its factorization.

1111999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2445.

The product of its digits is 729, while the sum is 31.

The square root of 1111999 is about 1054.5136319650. The cubic root of 1111999 is about 103.6019982918.

The spelling of 1111999 in words is "one million, one hundred eleven thousand, nine hundred ninety-nine".