1812105919 has 16 divisors (see below), whose sum is σ = 2048951520. Its totient is φ = 1590906240.

The previous prime is 1812105913. The next prime is 1812105941. The reversal of 1812105919 is 9195012181.

It is a cyclic number.

It is not a de Polignac number, because 1812105919 - 2¹⁷ = 1811974847 is a prime.

It is a super-2 number, since 2×1812105919² = 6567455723349669122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812105913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10612 + ... + 61129.

It is an arithmetic number, because the mean of its divisors is an integer number (128059470).

Almost surely, 2^1812105919 is an apocalyptic number.

1812105919 is a deficient number, since it is larger than the sum of its proper divisors (236845601).

1812105919 is a wasteful number, since it uses less digits than its factorization.

1812105919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71850.

The product of its (nonzero) digits is 6480, while the sum is 37.

The square root of 1812105919 is about 42568.8374165891. The cubic root of 1812105919 is about 1219.1613691448.

The spelling of 1812105919 in words is "one billion, eight hundred twelve million, one hundred five thousand, nine hundred nineteen".