1812822019 has 4 divisors (see below), whose sum is σ = 1812998680. Its totient is φ = 1812645360.

The previous prime is 1812822001. The next prime is 1812822071. The reversal of 1812822019 is 9102282181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9102282181 = 73 ⋅124688797.

It is a cyclic number.

It is not a de Polignac number, because 1812822019 - 2¹⁷ = 1812690947 is a prime.

It is a super-2 number, since 2×1812822019² = 6572647345142472722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1812822719) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 71922 + ... + 93799.

It is an arithmetic number, because the mean of its divisors is an integer number (453249670).

Almost surely, 2^1812822019 is an apocalyptic number.

1812822019 is a deficient number, since it is larger than the sum of its proper divisors (176661).

1812822019 is a wasteful number, since it uses less digits than its factorization.

1812822019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176660.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 1812822019 is about 42577.2476682089. The cubic root of 1812822019 is about 1219.3219422605.

The spelling of 1812822019 in words is "one billion, eight hundred twelve million, eight hundred twenty-two thousand, nineteen".