43045591 has 4 divisors (see below), whose sum is σ = 43067872. Its totient is φ = 43023312.

The previous prime is 43045589. The next prime is 43045603. The reversal of 43045591 is 19554034.

43045591 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, and also an emirpimes, since its reverse is a distinct semiprime: 19554034 = 2 ⋅9777017.

It is a cyclic number.

It is not a de Polignac number, because 43045591 - 2¹ = 43045589 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43045511) 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, 7935 + ... + 12208.

It is an arithmetic number, because the mean of its divisors is an integer number (10766968).

Almost surely, 2^43045591 is an apocalyptic number.

43045591 is a deficient number, since it is larger than the sum of its proper divisors (22281).

43045591 is a wasteful number, since it uses less digits than its factorization.

43045591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22280.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 43045591 is about 6560.9138845133. The cubic root of 43045591 is about 350.4635789107.

The spelling of 43045591 in words is "forty-three million, forty-five thousand, five hundred ninety-one".