1881444443 has 2 divisors, whose sum is σ = 1881444444. Its totient is φ = 1881444442.

The previous prime is 1881444419. The next prime is 1881444457. The reversal of 1881444443 is 3444441881.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1881444443 - 2¹² = 1881440347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1881444443.

It is not a weakly prime, because it can be changed into another prime (1881444473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 940722221 + 940722222.

It is an arithmetic number, because the mean of its divisors is an integer number (940722222).

Almost surely, 2^1881444443 is an apocalyptic number.

1881444443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1881444443 is an equidigital number, since it uses as much as digits as its factorization.

1881444443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 196608, while the sum is 41.

The square root of 1881444443 is about 43375.6203759670. The cubic root of 1881444443 is about 1234.5171650888.

The spelling of 1881444443 in words is "one billion, eight hundred eighty-one million, four hundred forty-four thousand, four hundred forty-three".