243160591 has 4 divisors (see below), whose sum is σ = 246491632. Its totient is φ = 239829552.

The previous prime is 243160583. The next prime is 243160607. The reversal of 243160591 is 195061342.

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 243160591 - 2³ = 243160583 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 (243160391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1665411 + ... + 1665556.

It is an arithmetic number, because the mean of its divisors is an integer number (61622908).

Almost surely, 2^243160591 is an apocalyptic number.

243160591 is a deficient number, since it is larger than the sum of its proper divisors (3331041).

243160591 is an equidigital number, since it uses as much as digits as its factorization.

243160591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3331040.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 243160591 is about 15593.6073761013. The cubic root of 243160591 is about 624.1625827930.

The spelling of 243160591 in words is "two hundred forty-three million, one hundred sixty thousand, five hundred ninety-one".