4442149981 has 2 divisors, whose sum is σ = 4442149982. Its totient is φ = 4442149980.

The previous prime is 4442149979. The next prime is 4442150039. The reversal of 4442149981 is 1899412444.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2955661956 + 1486488025 = 54366^2 + 38555^2 .

It is a cyclic number.

It is not a de Polignac number, because 4442149981 - 2¹ = 4442149979 is a prime.

It is a super-2 number, since 2×4442149981² = 39465392907396600722, which contains 22 as substring.

Together with 4442149979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4445149981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2221074990 + 2221074991.

It is an arithmetic number, because the mean of its divisors is an integer number (2221074991).

Almost surely, 2^4442149981 is an apocalyptic number.

It is an amenable number.

4442149981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4442149981 is an equidigital number, since it uses as much as digits as its factorization.

4442149981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 331776, while the sum is 46.

The square root of 4442149981 is about 66649.4559692725. The cubic root of 4442149981 is about 1643.8584025122.

The spelling of 4442149981 in words is "four billion, four hundred forty-two million, one hundred forty-nine thousand, nine hundred eighty-one".