320506243 has 4 divisors (see below), whose sum is σ = 324367848. Its totient is φ = 316644640.

The previous prime is 320506189. The next prime is 320506259. The reversal of 320506243 is 342605023.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342605023 = 10531 ⋅32533.

It is a cyclic number.

It is not a de Polignac number, because 320506243 - 2²⁵ = 286951811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320506643) 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, 1930678 + ... + 1930843.

It is an arithmetic number, because the mean of its divisors is an integer number (81091962).

Almost surely, 2^320506243 is an apocalyptic number.

320506243 is a deficient number, since it is larger than the sum of its proper divisors (3861605).

320506243 is an equidigital number, since it uses as much as digits as its factorization.

320506243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3861604.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 320506243 is about 17902.6881501075. The cubic root of 320506243 is about 684.3508816949.

The spelling of 320506243 in words is "three hundred twenty million, five hundred six thousand, two hundred forty-three".