43408661 has 2 divisors, whose sum is σ = 43408662. Its totient is φ = 43408660.

The previous prime is 43408657. The next prime is 43408663. The reversal of 43408661 is 16680434.

43408661 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., 29495761 + 13912900 = 5431^2 + 3730^2 .

It is a cyclic number.

It is not a de Polignac number, because 43408661 - 2² = 43408657 is a prime.

It is a Sophie Germain prime.

Together with 43408663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is equal to p_2627771 and since 43408661 and 2627771 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43408663) 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, 21704330 + 21704331.

It is an arithmetic number, because the mean of its divisors is an integer number (21704331).

Almost surely, 2^43408661 is an apocalyptic number.

It is an amenable number.

43408661 is a deficient number, since it is larger than the sum of its proper divisors (1).

43408661 is an equidigital number, since it uses as much as digits as its factorization.

43408661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 43408661 is about 6588.5249487271. The cubic root of 43408661 is about 351.4461552174.

The spelling of 43408661 in words is "forty-three million, four hundred eight thousand, six hundred sixty-one".