43661963 has 2 divisors, whose sum is σ = 43661964. Its totient is φ = 43661962.

The previous prime is 43661953. The next prime is 43662011. The reversal of 43661963 is 36916634.

43661963 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43661963 is a prime.

It is not a weakly prime, because it can be changed into another prime (43661903) 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 as a sum of consecutive naturals, namely, 21830981 + 21830982.

It is an arithmetic number, because the mean of its divisors is an integer number (21830982).

Almost surely, 2^43661963 is an apocalyptic number.

43661963 is a deficient number, since it is larger than the sum of its proper divisors (1).

43661963 is an equidigital number, since it uses as much as digits as its factorization.

43661963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 38.

The square root of 43661963 is about 6607.7199547196. The cubic root of 43661963 is about 352.1284262573.

The spelling of 43661963 in words is "forty-three million, six hundred sixty-one thousand, nine hundred sixty-three".