43106561 has 2 divisors, whose sum is σ = 43106562. Its totient is φ = 43106560.

The previous prime is 43106551. The next prime is 43106617. The reversal of 43106561 is 16560134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37442161 + 5664400 = 6119^2 + 2380^2 .

It is a cyclic number.

It is not a de Polignac number, because 43106561 - 2²² = 38912257 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43106561.

It is not a weakly prime, because it can be changed into another prime (43106551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21553280 + 21553281.

It is an arithmetic number, because the mean of its divisors is an integer number (21553281).

Almost surely, 2^43106561 is an apocalyptic number.

It is an amenable number.

43106561 is a deficient number, since it is larger than the sum of its proper divisors (1).

43106561 is an equidigital number, since it uses as much as digits as its factorization.

43106561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 43106561 is about 6565.5586967142. The cubic root of 43106561 is about 350.6289669979.

Adding to 43106561 its reverse (16560134), we get a palindrome (59666695).

The spelling of 43106561 in words is "forty-three million, one hundred six thousand, five hundred sixty-one".