43661201 has 2 divisors, whose sum is σ = 43661202. Its totient is φ = 43661200.

The previous prime is 43661173. The next prime is 43661207. The reversal of 43661201 is 10216634.

It is a happy number.

43661201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23049601 + 20611600 = 4801^2 + 4540^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43661201 is a prime.

It is not a weakly prime, because it can be changed into another prime (43661207) 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, 21830600 + 21830601.

It is an arithmetic number, because the mean of its divisors is an integer number (21830601).

Almost surely, 2^43661201 is an apocalyptic number.

It is an amenable number.

43661201 is a deficient number, since it is larger than the sum of its proper divisors (1).

43661201 is an equidigital number, since it uses as much as digits as its factorization.

43661201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 43661201 is about 6607.6622946395. The cubic root of 43661201 is about 352.1263777662.

Adding to 43661201 its reverse (10216634), we get a palindrome (53877835).

The spelling of 43661201 in words is "forty-three million, six hundred sixty-one thousand, two hundred one".