43554661 has 4 divisors (see below), whose sum is σ = 44731852. Its totient is φ = 42377472.

The previous prime is 43554619. The next prime is 43554701. The reversal of 43554661 is 16645534.

43554661 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 28196100 + 15358561 = 5310^2 + 3919^2 .

It is a cyclic number.

It is not a de Polignac number, because 43554661 - 2¹⁵ = 43521893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43554601) 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, 588540 + ... + 588613.

It is an arithmetic number, because the mean of its divisors is an integer number (11182963).

Almost surely, 2^43554661 is an apocalyptic number.

It is an amenable number.

43554661 is a deficient number, since it is larger than the sum of its proper divisors (1177191).

43554661 is a wasteful number, since it uses less digits than its factorization.

43554661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177190.

The product of its digits is 43200, while the sum is 34.

The square root of 43554661 is about 6599.5955179087. The cubic root of 43554661 is about 351.8397304347.

The spelling of 43554661 in words is "forty-three million, five hundred fifty-four thousand, six hundred sixty-one".