43661641 has 8 divisors (see below), whose sum is σ = 45246080. Its totient is φ = 42103152.

The previous prime is 43661633. The next prime is 43661687. The reversal of 43661641 is 14616634.

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 43661641 - 2³ = 43661633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43661041) 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, 3030 + ... + 9823.

It is an arithmetic number, because the mean of its divisors is an integer number (5655760).

Almost surely, 2^43661641 is an apocalyptic number.

It is an amenable number.

43661641 is a deficient number, since it is larger than the sum of its proper divisors (1584439).

43661641 is a wasteful number, since it uses less digits than its factorization.

43661641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12975.

The product of its digits is 10368, while the sum is 31.

The square root of 43661641 is about 6607.6955892353. The cubic root of 43661641 is about 352.1275606249.

The spelling of 43661641 in words is "forty-three million, six hundred sixty-one thousand, six hundred forty-one".