40544681 has 4 divisors (see below), whose sum is σ = 40559700. Its totient is φ = 40529664.

The previous prime is 40544671. The next prime is 40544701. The reversal of 40544681 is 18644504.

40544681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 6205081 + 34339600 = 2491^2 + 5860^2 .

It is a cyclic number.

It is not a de Polignac number, because 40544681 - 2¹⁴ = 40528297 is a prime.

It is a super-2 number, since 2×40544681² = 3287742314783522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40544641) 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 3 ways as a sum of consecutive naturals, for example, 2216 + ... + 9273.

It is an arithmetic number, because the mean of its divisors is an integer number (10139925).

Almost surely, 2^40544681 is an apocalyptic number.

It is an amenable number.

40544681 is a deficient number, since it is larger than the sum of its proper divisors (15019).

40544681 is a wasteful number, since it uses less digits than its factorization.

40544681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15018.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 40544681 is about 6367.4705338933. The cubic root of 40544681 is about 343.5405151847.

The spelling of 40544681 in words is "forty million, five hundred forty-four thousand, six hundred eighty-one".