44441581 has 4 divisors (see below), whose sum is σ = 45525564. Its totient is φ = 43357600.

The previous prime is 44441557. The next prime is 44441591. The reversal of 44441581 is 18514444.

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 7645225 + 36796356 = 2765^2 + 6066^2 .

It is a cyclic number.

It is not a de Polignac number, because 44441581 - 2⁵ = 44441549 is a prime.

It is a super-2 number, since 2×44441581² = 3950108243559122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44441521) 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, 541930 + ... + 542011.

It is an arithmetic number, because the mean of its divisors is an integer number (11381391).

Almost surely, 2^44441581 is an apocalyptic number.

44441581 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

44441581 is a deficient number, since it is larger than the sum of its proper divisors (1083983).

44441581 is a wasteful number, since it uses less digits than its factorization.

44441581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083982.

The product of its digits is 10240, while the sum is 31.

The square root of 44441581 is about 6666.4519048741. The cubic root of 44441581 is about 354.2119157381.

It can be divided in two parts, 444 and 41581, that added together give a square (42025 = 205²).

The spelling of 44441581 in words is "forty-four million, four hundred forty-one thousand, five hundred eighty-one".