44081981 has 4 divisors (see below), whose sum is σ = 44223132. Its totient is φ = 43940832.

The previous prime is 44081977. The next prime is 44081987. The reversal of 44081981 is 18918044.

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 20160100 + 23921881 = 4490^2 + 4891^2 .

It is a cyclic number.

It is not a de Polignac number, because 44081981 - 2² = 44081977 is a prime.

It is a super-2 number, since 2×44081981² = 3886442097768722, 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 (44081987) 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, 70106 + ... + 70731.

It is an arithmetic number, because the mean of its divisors is an integer number (11055783).

Almost surely, 2^44081981 is an apocalyptic number.

It is an amenable number.

44081981 is a deficient number, since it is larger than the sum of its proper divisors (141151).

44081981 is a wasteful number, since it uses less digits than its factorization.

44081981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141150.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 44081981 is about 6639.4262553326. The cubic root of 44081981 is about 353.2539562010.

The spelling of 44081981 in words is "forty-four million, eighty-one thousand, nine hundred eighty-one".