1819812105 has 12 divisors (see below), whose sum is σ = 3154341060. Its totient is φ = 970566432.

The previous prime is 1819812097. The next prime is 1819812119. The reversal of 1819812105 is 5012189181.

It can be written as a sum of positive squares in 2 ways, for example, as 984139641 + 835672464 = 31371^2 + 28908^2 .

It is not a de Polignac number, because 1819812105 - 2³ = 1819812097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1819812105.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20220090 + ... + 20220179.

It is an arithmetic number, because the mean of its divisors is an integer number (262861755).

Almost surely, 2^1819812105 is an apocalyptic number.

1819812105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1819812105 is a deficient number, since it is larger than the sum of its proper divisors (1334528955).

1819812105 is a wasteful number, since it uses less digits than its factorization.

1819812105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40440280 (or 40440277 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 36.

The square root of 1819812105 is about 42659.2557951964. The cubic root of 1819812105 is about 1220.8871324615.

It can be divided in two parts, 18198 and 12105, that added together give a palindrome (30303).

The spelling of 1819812105 in words is "one billion, eight hundred nineteen million, eight hundred twelve thousand, one hundred five".