1819810116 has 18 divisors (see below), whose sum is σ = 4600075662. Its totient is φ = 606603360.

The previous prime is 1819810093. The next prime is 1819810127. The reversal of 1819810116 is 6110189181.

It can be written as a sum of positive squares in only one way, i.e., 1179922500 + 639887616 = 34350^2 + 25296^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 50550281 = 1819810116 / (1 + 8 + 1 + 9 + 8 + 1 + 0 + 1 + 1 + 6).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25275105 + ... + 25275176.

It is an arithmetic number, because the mean of its divisors is an integer number (255559759).

Almost surely, 2^1819810116 is an apocalyptic number.

It is an amenable number.

1819810116 is an abundant number, since it is smaller than the sum of its proper divisors (2780265546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1819810116 is a wasteful number, since it uses less digits than its factorization.

1819810116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50550291 (or 50550286 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 36.

The square root of 1819810116 is about 42659.2324825471. The cubic root of 1819810116 is about 1220.8866876637.

Adding to 1819810116 its reverse (6110189181), we get a palindrome (7929999297).

The spelling of 1819810116 in words is "one billion, eight hundred nineteen million, eight hundred ten thousand, one hundred sixteen".