43566161 has 2 divisors, whose sum is σ = 43566162. Its totient is φ = 43566160.

The previous prime is 43566143. The next prime is 43566167. The reversal of 43566161 is 16166534.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36966400 + 6599761 = 6080^2 + 2569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43566161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43566167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21783080 + 21783081.

It is an arithmetic number, because the mean of its divisors is an integer number (21783081).

Almost surely, 2^43566161 is an apocalyptic number.

It is an amenable number.

43566161 is a deficient number, since it is larger than the sum of its proper divisors (1).

43566161 is an equidigital number, since it uses as much as digits as its factorization.

43566161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 43566161 is about 6600.4667259217. The cubic root of 43566161 is about 351.8706938322.

The spelling of 43566161 in words is "forty-three million, five hundred sixty-six thousand, one hundred sixty-one".