1444009981 has 4 divisors (see below), whose sum is σ = 1451492092. Its totient is φ = 1436527872.

The previous prime is 1444009951. The next prime is 1444009993. The reversal of 1444009981 is 1899004441.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 260305956 + 1183704025 = 16134^2 + 34405^2 .

It is a cyclic number.

It is not a de Polignac number, because 1444009981 - 2¹³ = 1444001789 is a prime.

It is a super-2 number, since 2×1444009981² = 4170329650455240722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1444009921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3740766 + ... + 3741151.

It is an arithmetic number, because the mean of its divisors is an integer number (362873023).

Almost surely, 2^1444009981 is an apocalyptic number.

It is an amenable number.

1444009981 is a deficient number, since it is larger than the sum of its proper divisors (7482111).

1444009981 is an equidigital number, since it uses as much as digits as its factorization.

1444009981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7482110.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1444009981 is about 38000.1313287204. The cubic root of 1444009981 is about 1130.2904677881.

The spelling of 1444009981 in words is "one billion, four hundred forty-four million, nine thousand, nine hundred eighty-one".