320511481 has 4 divisors (see below), whose sum is σ = 323684964. Its totient is φ = 317338000.

The previous prime is 320511469. The next prime is 320511487. The reversal of 320511481 is 184115023.

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

It can be written as a sum of positive squares in 2 ways, for example, as 169000000 + 151511481 = 13000^2 + 12309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320511481 is a prime.

It is a super-2 number, since 2×320511481² = 205455218905626722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320511487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1586590 + ... + 1586791.

It is an arithmetic number, because the mean of its divisors is an integer number (80921241).

Almost surely, 2^320511481 is an apocalyptic number.

It is an amenable number.

320511481 is a deficient number, since it is larger than the sum of its proper divisors (3173483).

320511481 is a wasteful number, since it uses less digits than its factorization.

320511481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173482.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 320511481 is about 17902.8344403896. The cubic root of 320511481 is about 684.3546097662.

The spelling of 320511481 in words is "three hundred twenty million, five hundred eleven thousand, four hundred eighty-one".