320540543 has 4 divisors (see below), whose sum is σ = 325795368. Its totient is φ = 315285720.

The previous prime is 320540537. The next prime is 320540587. The reversal of 320540543 is 345045023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 345045023 = 157 ⋅2197739.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320540543 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 (320540503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2627321 + ... + 2627442.

It is an arithmetic number, because the mean of its divisors is an integer number (81448842).

Almost surely, 2^320540543 is an apocalyptic number.

320540543 is a deficient number, since it is larger than the sum of its proper divisors (5254825).

320540543 is an equidigital number, since it uses as much as digits as its factorization.

320540543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5254824.

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 320540543 is about 17903.6460811758. The cubic root of 320540543 is about 684.3752934897.

Adding to 320540543 its reverse (345045023), we get a palindrome (665585566).

The spelling of 320540543 in words is "three hundred twenty million, five hundred forty thousand, five hundred forty-three".