320115521 has 12 divisors (see below), whose sum is σ = 357549840. Its totient is φ = 284228280.

The previous prime is 320115511. The next prime is 320115529. The reversal of 320115521 is 125511023.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-320115521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320115493 and 320115502.

It is not an unprimeable number, because it can be changed into a prime (320115529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12470 + ... + 28208.

It is an arithmetic number, because the mean of its divisors is an integer number (29795820).

Almost surely, 2^320115521 is an apocalyptic number.

It is an amenable number.

320115521 is a deficient number, since it is larger than the sum of its proper divisors (37434319).

320115521 is a wasteful number, since it uses less digits than its factorization.

320115521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15836 (or 15793 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 320115521 is about 17891.7724387496. The cubic root of 320115521 is about 684.0726763230.

Adding to 320115521 its reverse (125511023), we get a palindrome (445626544).

The spelling of 320115521 in words is "three hundred twenty million, one hundred fifteen thousand, five hundred twenty-one".