43656961 has 4 divisors (see below), whose sum is σ = 43718400. Its totient is φ = 43595524.

The previous prime is 43656953. The next prime is 43656983. The reversal of 43656961 is 16965634.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43656961 - 2³ = 43656953 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43656931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29641 + ... + 31078.

It is an arithmetic number, because the mean of its divisors is an integer number (10929600).

Almost surely, 2^43656961 is an apocalyptic number.

It is an amenable number.

43656961 is a deficient number, since it is larger than the sum of its proper divisors (61439).

43656961 is an equidigital number, since it uses as much as digits as its factorization.

43656961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61438.

The product of its digits is 116640, while the sum is 40.

The square root of 43656961 is about 6607.3414472086. The cubic root of 43656961 is about 352.1149789030.

The spelling of 43656961 in words is "forty-three million, six hundred fifty-six thousand, nine hundred sixty-one".