1810219005 has 72 divisors (see below), whose sum is σ = 3775987800. Its totient is φ = 798964992.

The previous prime is 1810218997. The next prime is 1810219039. The reversal of 1810219005 is 5009120181.

It can be written as a sum of positive squares in 4 ways, for example, as 155600676 + 1654618329 = 12474^2 + 40677^2 .

It is not a de Polignac number, because 1810219005 - 2³ = 1810218997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1810219005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 49791 + ... + 78099.

It is an arithmetic number, because the mean of its divisors is an integer number (52444275).

Almost surely, 2^1810219005 is an apocalyptic number.

1810219005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1810219005 is an abundant number, since it is smaller than the sum of its proper divisors (1965768795).

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

1810219005 is a wasteful number, since it uses less digits than its factorization.

1810219005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28363 (or 28353 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 1810219005 is about 42546.6685534837. The cubic root of 1810219005 is about 1218.7380584234.

Adding to 1810219005 its reverse (5009120181), we get a palindrome (6819339186).

The spelling of 1810219005 in words is "one billion, eight hundred ten million, two hundred nineteen thousand, five".