320542505 has 4 divisors (see below), whose sum is σ = 384651012. Its totient is φ = 256434000.

The previous prime is 320542501. The next prime is 320542517. The reversal of 320542505 is 505245023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505245023 = 227 ⋅2225749.

It can be written as a sum of positive squares in 2 ways, for example, as 89624089 + 230918416 = 9467^2 + 15196^2 .

It is not a de Polignac number, because 320542505 - 2² = 320542501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320542501) 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, 32054246 + ... + 32054255.

It is an arithmetic number, because the mean of its divisors is an integer number (96162753).

Almost surely, 2^320542505 is an apocalyptic number.

It is an amenable number.

320542505 is a deficient number, since it is larger than the sum of its proper divisors (64108507).

320542505 is an equidigital number, since it uses as much as digits as its factorization.

320542505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64108506.

The product of its (nonzero) digits is 6000, while the sum is 26.

The square root of 320542505 is about 17903.7008744002. The cubic root of 320542505 is about 684.3766898202.

Adding to 320542505 its reverse (505245023), we get a palindrome (825787528).

The spelling of 320542505 in words is "three hundred twenty million, five hundred forty-two thousand, five hundred five".