1812923899 has 2 divisors, whose sum is σ = 1812923900. Its totient is φ = 1812923898.

The previous prime is 1812923867. The next prime is 1812923921. The reversal of 1812923899 is 9983292181.

It is a strong prime.

It is an emirp because it is prime and its reverse (9983292181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1812923899 - 2⁵ = 1812923867 is a prime.

It is not a weakly prime, because it can be changed into another prime (1812923699) 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, 906461949 + 906461950.

It is an arithmetic number, because the mean of its divisors is an integer number (906461950).

Almost surely, 2^1812923899 is an apocalyptic number.

1812923899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812923899 is an equidigital number, since it uses as much as digits as its factorization.

1812923899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 52.

The square root of 1812923899 is about 42578.4440650431. Note that the first 3 decimals coincide. The cubic root of 1812923899 is about 1219.3447836631.

The spelling of 1812923899 in words is "one billion, eight hundred twelve million, nine hundred twenty-three thousand, eight hundred ninety-nine".