320887331 has 2 divisors, whose sum is σ = 320887332. Its totient is φ = 320887330.

The previous prime is 320887319. The next prime is 320887337. The reversal of 320887331 is 133788023.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 320887331 - 2¹⁴ = 320870947 is a prime.

It is a super-2 number, since 2×320887331² = 205937358392607122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 320887291 and 320887300.

It is not a weakly prime, because it can be changed into another prime (320887337) 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 as a sum of consecutive naturals, namely, 160443665 + 160443666.

It is an arithmetic number, because the mean of its divisors is an integer number (160443666).

Almost surely, 2^320887331 is an apocalyptic number.

320887331 is a deficient number, since it is larger than the sum of its proper divisors (1).

320887331 is an equidigital number, since it uses as much as digits as its factorization.

320887331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 320887331 is about 17913.3283060407. The cubic root of 320887331 is about 684.6220096559.

The spelling of 320887331 in words is "three hundred twenty million, eight hundred eighty-seven thousand, three hundred thirty-one".