1443041981 has 2 divisors, whose sum is σ = 1443041982. Its totient is φ = 1443041980.

The previous prime is 1443041939. The next prime is 1443042071. The reversal of 1443041981 is 1891403441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1358585881 + 84456100 = 36859^2 + 9190^2 .

It is a cyclic number.

It is not a de Polignac number, because 1443041981 - 2²² = 1438847677 is a prime.

It is a super-2 number, since 2×1443041981² = 4164740317856808722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1443041381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 721520990 + 721520991.

It is an arithmetic number, because the mean of its divisors is an integer number (721520991).

Almost surely, 2^1443041981 is an apocalyptic number.

It is an amenable number.

1443041981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1443041981 is an equidigital number, since it uses as much as digits as its factorization.

1443041981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 1443041981 is about 37987.3923953724. The cubic root of 1443041981 is about 1130.0378458622.

The spelling of 1443041981 in words is "one billion, four hundred forty-three million, forty-one thousand, nine hundred eighty-one".