43604581 has 2 divisors, whose sum is σ = 43604582. Its totient is φ = 43604580.

The previous prime is 43604557. The next prime is 43604591. The reversal of 43604581 is 18540634.

It is a happy number.

43604581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41152225 + 2452356 = 6415^2 + 1566^2 .

It is a cyclic number.

It is not a de Polignac number, because 43604581 - 2⁵ = 43604549 is a prime.

It is a super-2 number, since 2×43604581² = 3802718968371122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43604551) 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 as a sum of consecutive naturals, namely, 21802290 + 21802291.

It is an arithmetic number, because the mean of its divisors is an integer number (21802291).

Almost surely, 2^43604581 is an apocalyptic number.

It is an amenable number.

43604581 is a deficient number, since it is larger than the sum of its proper divisors (1).

43604581 is an equidigital number, since it uses as much as digits as its factorization.

43604581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 43604581 is about 6603.3764847993. The cubic root of 43604581 is about 351.9740990110.

The spelling of 43604581 in words is "forty-three million, six hundred four thousand, five hundred eighty-one".