43631661 has 8 divisors (see below), whose sum is σ = 58402944. Its totient is φ = 28974080.

The previous prime is 43631659. The next prime is 43631669. The reversal of 43631661 is 16613634.

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 43631661 - 2¹ = 43631659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43631669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27525 + ... + 29066.

It is an arithmetic number, because the mean of its divisors is an integer number (7300368).

Almost surely, 2^43631661 is an apocalyptic number.

It is an amenable number.

43631661 is a deficient number, since it is larger than the sum of its proper divisors (14771283).

43631661 is a wasteful number, since it uses less digits than its factorization.

43631661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56851.

The product of its digits is 7776, while the sum is 30.

The square root of 43631661 is about 6605.4266327013. The cubic root of 43631661 is about 352.0469467558.

The spelling of 43631661 in words is "forty-three million, six hundred thirty-one thousand, six hundred sixty-one".