320319561 has 8 divisors (see below), whose sum is σ = 428669824. Its totient is φ = 212757840.

The previous prime is 320319557. The next prime is 320319569. The reversal of 320319561 is 165913023.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 320319561 - 2² = 320319557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (320319569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196186 + ... + 197811.

It is an arithmetic number, because the mean of its divisors is an integer number (53583728).

Almost surely, 2^320319561 is an apocalyptic number.

It is an amenable number.

320319561 is a deficient number, since it is larger than the sum of its proper divisors (108350263).

320319561 is a wasteful number, since it uses less digits than its factorization.

320319561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394271.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 320319561 is about 17897.4735926611. The cubic root of 320319561 is about 684.2179869319.

The spelling of 320319561 in words is "three hundred twenty million, three hundred nineteen thousand, five hundred sixty-one".