43591091 has 4 divisors (see below), whose sum is σ = 43612800. Its totient is φ = 43569384.

The previous prime is 43591087. The next prime is 43591127. The reversal of 43591091 is 19019534.

43591091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43591091 - 2² = 43591087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43591021) 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 in 3 ways as a sum of consecutive naturals, for example, 7496 + ... + 11973.

It is an arithmetic number, because the mean of its divisors is an integer number (10903200).

Almost surely, 2^43591091 is an apocalyptic number.

43591091 is a deficient number, since it is larger than the sum of its proper divisors (21709).

43591091 is a wasteful number, since it uses less digits than its factorization.

43591091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21708.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 43591091 is about 6602.3549586492. The cubic root of 43591091 is about 351.9377983884.

The spelling of 43591091 in words is "forty-three million, five hundred ninety-one thousand, ninety-one".