43573661 has 8 divisors (see below), whose sum is σ = 45939264. Its totient is φ = 41247360.

The previous prime is 43573643. The next prime is 43573667. The reversal of 43573661 is 16637534.

43573661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 43573661 - 2¹⁰ = 43572637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43573667) 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, 7535 + ... + 11996.

It is an arithmetic number, because the mean of its divisors is an integer number (5742408).

Almost surely, 2^43573661 is an apocalyptic number.

It is an amenable number.

43573661 is a deficient number, since it is larger than the sum of its proper divisors (2365603).

43573661 is a wasteful number, since it uses less digits than its factorization.

43573661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19651.

The product of its digits is 45360, while the sum is 35.

The square root of 43573661 is about 6601.0348431136. The cubic root of 43573661 is about 351.8908844168.

The spelling of 43573661 in words is "forty-three million, five hundred seventy-three thousand, six hundred sixty-one".