1811323 has 2 divisors, whose sum is σ = 1811324. Its totient is φ = 1811322.

The previous prime is 1811321. The next prime is 1811347. The reversal of 1811323 is 3231181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1811323 - 2¹ = 1811321 is a prime.

Together with 1811321, it forms a pair of twin primes.

1811323 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1811323.

It is not a weakly prime, because it can be changed into another prime (1811321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 905661 + 905662.

It is an arithmetic number, because the mean of its divisors is an integer number (905662).

2^1811323 is an apocalyptic number.

1811323 is a deficient number, since it is larger than the sum of its proper divisors (1).

1811323 is an equidigital number, since it uses as much as digits as its factorization.

1811323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 19.

The square root of 1811323 is about 1345.8540039692. The cubic root of 1811323 is about 121.8985764601.

The spelling of 1811323 in words is "one million, eight hundred eleven thousand, three hundred twenty-three".