43089091 has 2 divisors, whose sum is σ = 43089092. Its totient is φ = 43089090.

The previous prime is 43089089. The next prime is 43089191. The reversal of 43089091 is 19098034.

43089091 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 not a de Polignac number, because 43089091 - 2¹ = 43089089 is a prime.

Together with 43089089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (43089001) 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, 21544545 + 21544546.

It is an arithmetic number, because the mean of its divisors is an integer number (21544546).

Almost surely, 2^43089091 is an apocalyptic number.

43089091 is a deficient number, since it is larger than the sum of its proper divisors (1).

43089091 is an equidigital number, since it uses as much as digits as its factorization.

43089091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 43089091 is about 6564.2281343658. The cubic root of 43089091 is about 350.5815935772.

The spelling of 43089091 in words is "forty-three million, eighty-nine thousand, ninety-one".