1812811423 has 2 divisors, whose sum is σ = 1812811424. Its totient is φ = 1812811422.

The previous prime is 1812811421. The next prime is 1812811453. The reversal of 1812811423 is 3241182181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1812811423 - 2¹ = 1812811421 is a prime.

Together with 1812811421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1812811421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906405711 + 906405712.

It is an arithmetic number, because the mean of its divisors is an integer number (906405712).

Almost surely, 2^1812811423 is an apocalyptic number.

1812811423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812811423 is an equidigital number, since it uses as much as digits as its factorization.

1812811423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 31.

The square root of 1812811423 is about 42577.1232353714. The cubic root of 1812811423 is about 1219.3195665979.

The spelling of 1812811423 in words is "one billion, eight hundred twelve million, eight hundred eleven thousand, four hundred twenty-three".