1218811 has 8 divisors (see below), whose sum is σ = 1339200. Its totient is φ = 1100040.

The previous prime is 1218787. The next prime is 1218821. The reversal of 1218811 is 1188121.

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 1218811 - 2⁵ = 1218779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218821) 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, 1660 + ... + 2278.

It is an arithmetic number, because the mean of its divisors is an integer number (167400).

2^1218811 is an apocalyptic number.

1218811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1218811 is a deficient number, since it is larger than the sum of its proper divisors (120389).

1218811 is a wasteful number, since it uses less digits than its factorization.

1218811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809.

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

The square root of 1218811 is about 1103.9977355049. The cubic root of 1218811 is about 106.8182491131.

It can be divided in two parts, 1 and 218811, that added together give a palindrome (218812).

The spelling of 1218811 in words is "one million, two hundred eighteen thousand, eight hundred eleven".