43405091 has 2 divisors, whose sum is σ = 43405092. Its totient is φ = 43405090.

The previous prime is 43405081. The next prime is 43405123. The reversal of 43405091 is 19050434.

43405091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43405091 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 43405091.

It is not a weakly prime, because it can be changed into another prime (43405001) 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, 21702545 + 21702546.

It is an arithmetic number, because the mean of its divisors is an integer number (21702546).

Almost surely, 2^43405091 is an apocalyptic number.

43405091 is a deficient number, since it is larger than the sum of its proper divisors (1).

43405091 is an equidigital number, since it uses as much as digits as its factorization.

43405091 is an odious number, because the sum of its binary digits is odd.

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

The square root of 43405091 is about 6588.2540175679. The cubic root of 43405091 is about 351.4365204491.

The spelling of 43405091 in words is "forty-three million, four hundred five thousand, ninety-one".