1881644441 has 4 divisors (see below), whose sum is σ = 1883280384. Its totient is φ = 1880008500.

The previous prime is 1881644431. The next prime is 1881644477. The reversal of 1881644441 is 1444461881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1881644441 - 2⁶ = 1881644377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1881644411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816245 + ... + 818546.

It is an arithmetic number, because the mean of its divisors is an integer number (470820096).

Almost surely, 2^1881644441 is an apocalyptic number.

It is an amenable number.

1881644441 is a deficient number, since it is larger than the sum of its proper divisors (1635943).

1881644441 is a wasteful number, since it uses less digits than its factorization.

1881644441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635942.

The product of its digits is 98304, while the sum is 41.

The square root of 1881644441 is about 43377.9257341796. The cubic root of 1881644441 is about 1234.5609066968.

The spelling of 1881644441 in words is "one billion, eight hundred eighty-one million, six hundred forty-four thousand, four hundred forty-one".