43118591 has 4 divisors (see below), whose sum is σ = 43134384. Its totient is φ = 43102800.

The previous prime is 43118531. The next prime is 43118609. The reversal of 43118591 is 19581134.

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 43118591 - 2²² = 38924287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43118501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2630 + ... + 9651.

It is an arithmetic number, because the mean of its divisors is an integer number (10783596).

Almost surely, 2^43118591 is an apocalyptic number.

43118591 is a deficient number, since it is larger than the sum of its proper divisors (15793).

43118591 is a wasteful number, since it uses less digits than its factorization.

43118591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15792.

The product of its digits is 4320, while the sum is 32.

The square root of 43118591 is about 6566.4747772302. The cubic root of 43118591 is about 350.6615813227.

The spelling of 43118591 in words is "forty-three million, one hundred eighteen thousand, five hundred ninety-one".