1116821 has 2 divisors, whose sum is σ = 1116822. Its totient is φ = 1116820.

The previous prime is 1116809. The next prime is 1116851. The reversal of 1116821 is 1286111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1020100 + 96721 = 1010^2 + 311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1116821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1116793 and 1116802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1116851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 558410 + 558411.

It is an arithmetic number, because the mean of its divisors is an integer number (558411).

2^1116821 is an apocalyptic number.

It is an amenable number.

1116821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1116821 is an equidigital number, since it uses as much as digits as its factorization.

1116821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 20.

The square root of 1116821 is about 1056.7975208147. The cubic root of 1116821 is about 103.7515333397.

The spelling of 1116821 in words is "one million, one hundred sixteen thousand, eight hundred twenty-one".