1851806099 has 32 divisors (see below), whose sum is σ = 2218358016. Its totient is φ = 1523617920.

The previous prime is 1851806087. The next prime is 1851806129. The reversal of 1851806099 is 9906081581.

It is not a de Polignac number, because 1851806099 - 2¹² = 1851802003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1851806029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3324329 + ... + 3324885.

It is an arithmetic number, because the mean of its divisors is an integer number (69323688).

Almost surely, 2^1851806099 is an apocalyptic number.

1851806099 is a deficient number, since it is larger than the sum of its proper divisors (366551917).

1851806099 is a wasteful number, since it uses less digits than its factorization.

1851806099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995.

The product of its (nonzero) digits is 155520, while the sum is 47.

The square root of 1851806099 is about 43032.6166878102. The cubic root of 1851806099 is about 1228.0003861667. Note that the first 3 decimals are identical.

The spelling of 1851806099 in words is "one billion, eight hundred fifty-one million, eight hundred six thousand, ninety-nine".