44181981 has 6 divisors (see below), whose sum is σ = 63818430. Its totient is φ = 29454648.

The previous prime is 44181961. The next prime is 44182007. The reversal of 44181981 is 18918144.

44181981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 27092025 + 17089956 = 5205^2 + 4134^2 .

It is not a de Polignac number, because 44181981 - 2⁷ = 44181853 is a prime.

It is a super-2 number, since 2×44181981² = 3904094890168722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44181931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2454546 + ... + 2454563.

It is an arithmetic number, because the mean of its divisors is an integer number (10636405).

Almost surely, 2^44181981 is an apocalyptic number.

It is an amenable number.

44181981 is a deficient number, since it is larger than the sum of its proper divisors (19636449).

44181981 is a wasteful number, since it uses less digits than its factorization.

44181981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4909115 (or 4909112 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 44181981 is about 6646.9527604760. The cubic root of 44181981 is about 353.5208734049.

The spelling of 44181981 in words is "forty-four million, one hundred eighty-one thousand, nine hundred eighty-one".