1851808099 has 2 divisors, whose sum is σ = 1851808100. Its totient is φ = 1851808098.

The previous prime is 1851808097. The next prime is 1851808121. The reversal of 1851808099 is 9908081581.

It is a weak prime.

It is an emirp because it is prime and its reverse (9908081581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1851808099 - 2¹ = 1851808097 is a prime.

Together with 1851808097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1851808093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925904049 + 925904050.

It is an arithmetic number, because the mean of its divisors is an integer number (925904050).

Almost surely, 2^1851808099 is an apocalyptic number.

1851808099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851808099 is an equidigital number, since it uses as much as digits as its factorization.

1851808099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 49.

The square root of 1851808099 is about 43032.6399259911. The cubic root of 1851808099 is about 1228.0008282576. Note that the first 3 decimals are identical.

The spelling of 1851808099 in words is "one billion, eight hundred fifty-one million, eight hundred eight thousand, ninety-nine".