43700561 has 2 divisors, whose sum is σ = 43700562. Its totient is φ = 43700560.

The previous prime is 43700521. The next prime is 43700581. The reversal of 43700561 is 16500734.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24690961 + 19009600 = 4969^2 + 4360^2 .

It is a cyclic number.

It is not a de Polignac number, because 43700561 - 2⁶ = 43700497 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 43700561.

It is not a weakly prime, because it can be changed into another prime (43700521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21850280 + 21850281.

It is an arithmetic number, because the mean of its divisors is an integer number (21850281).

Almost surely, 2^43700561 is an apocalyptic number.

It is an amenable number.

43700561 is a deficient number, since it is larger than the sum of its proper divisors (1).

43700561 is an equidigital number, since it uses as much as digits as its factorization.

43700561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 43700561 is about 6610.6399841468. The cubic root of 43700561 is about 352.2321584229.

The spelling of 43700561 in words is "forty-three million, seven hundred thousand, five hundred sixty-one".