1819881441 has 12 divisors (see below), whose sum is σ = 3004248832. Its totient is φ = 1039932216.

The previous prime is 1819881439. The next prime is 1819881449. The reversal of 1819881441 is 1441889181.

1819881441 is a `hidden beast` number, since 18 + 198 + 8 + 1 + 441 = 666.

It is not a de Polignac number, because 1819881441 - 2¹ = 1819881439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1819881449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14443441 + ... + 14443566.

Almost surely, 2^1819881441 is an apocalyptic number.

It is an amenable number.

1819881441 is a deficient number, since it is larger than the sum of its proper divisors (1184367391).

1819881441 is a wasteful number, since it uses less digits than its factorization.

1819881441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28887020 (or 28887017 counting only the distinct ones).

The product of its digits is 73728, while the sum is 45.

The square root of 1819881441 is about 42660.0684598607. The cubic root of 1819881441 is about 1220.9026377903.

The spelling of 1819881441 in words is "one billion, eight hundred nineteen million, eight hundred eighty-one thousand, four hundred forty-one".