1821233 has 2 divisors, whose sum is σ = 1821234. Its totient is φ = 1821232.

The previous prime is 1821191. The next prime is 1821257. The reversal of 1821233 is 3321281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1620529 + 200704 = 1273^2 + 448^2 .

It is a cyclic number.

It is not a de Polignac number, because 1821233 - 2⁸ = 1820977 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1821263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910616 + 910617.

It is an arithmetic number, because the mean of its divisors is an integer number (910617).

2^1821233 is an apocalyptic number.

It is an amenable number.

1821233 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821233 is an equidigital number, since it uses as much as digits as its factorization.

1821233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 20.

The square root of 1821233 is about 1349.5306591552. The cubic root of 1821233 is about 122.1204802826.

The spelling of 1821233 in words is "one million, eight hundred twenty-one thousand, two hundred thirty-three".