41640581 has 8 divisors (see below), whose sum is σ = 42069720. Its totient is φ = 41213952.

The previous prime is 41640569. The next prime is 41640611. The reversal of 41640581 is 18504614.

41640581 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 4 ways, for example, as 2076481 + 39564100 = 1441^2 + 6290^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 41640581 - 2⁶ = 41640517 is a prime.

It is a super-2 number, since 2×41640581² = 3467875972035122, 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 (41640541) 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 7 ways as a sum of consecutive naturals, for example, 53765 + ... + 54533.

It is an arithmetic number, because the mean of its divisors is an integer number (5258715).

Almost surely, 2^41640581 is an apocalyptic number.

It is an amenable number.

41640581 is a deficient number, since it is larger than the sum of its proper divisors (429139).

41640581 is a wasteful number, since it uses less digits than its factorization.

41640581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 41640581 is about 6452.9513402783. The cubic root of 41640581 is about 346.6082749079.

The spelling of 41640581 in words is "forty-one million, six hundred forty thousand, five hundred eighty-one".