1118681 has 4 divisors (see below), whose sum is σ = 1121232. Its totient is φ = 1116132.

The previous prime is 1118659. The next prime is 1118713. The reversal of 1118681 is 1868111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1118681 - 2¹⁰ = 1117657 is a prime.

It is a super-2 number, since 2×1118681² = 2502894359522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1118681.

It is not an unprimeable number, because it can be changed into a prime (1118081) 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, 431 + ... + 1556.

It is an arithmetic number, because the mean of its divisors is an integer number (280308).

2^1118681 is an apocalyptic number.

It is an amenable number.

1118681 is a deficient number, since it is larger than the sum of its proper divisors (2551).

1118681 is an equidigital number, since it uses as much as digits as its factorization.

1118681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550.

The product of its digits is 384, while the sum is 26.

The square root of 1118681 is about 1057.6771719197. The cubic root of 1118681 is about 103.8090987627.

The spelling of 1118681 in words is "one million, one hundred eighteen thousand, six hundred eighty-one".