320518047 has 4 divisors (see below), whose sum is σ = 427357400. Its totient is φ = 213678696.

The previous prime is 320518043. The next prime is 320518091. The reversal of 320518047 is 740815023.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 320518047 - 2² = 320518043 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 (320518043) 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, 53419672 + ... + 53419677.

It is an arithmetic number, because the mean of its divisors is an integer number (106839350).

Almost surely, 2^320518047 is an apocalyptic number.

320518047 is a deficient number, since it is larger than the sum of its proper divisors (106839353).

320518047 is a wasteful number, since it uses less digits than its factorization.

320518047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106839352.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 320518047 is about 17903.0178182339. The cubic root of 320518047 is about 684.3592829651.

The spelling of 320518047 in words is "three hundred twenty million, five hundred eighteen thousand, forty-seven".