8520321331 has 2 divisors, whose sum is σ = 8520321332. Its totient is φ = 8520321330.

The previous prime is 8520321323. The next prime is 8520321343. The reversal of 8520321331 is 1331230258.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8520321331 - 2³ = 8520321323 is a prime.

It is a super-2 number, since 2×8520321331² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8520321331.

It is not a weakly prime, because it can be changed into another prime (8520321311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260160665 + 4260160666.

It is an arithmetic number, because the mean of its divisors is an integer number (4260160666).

Almost surely, 2^8520321331 is an apocalyptic number.

8520321331 is a deficient number, since it is larger than the sum of its proper divisors (1).

8520321331 is an equidigital number, since it uses as much as digits as its factorization.

8520321331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 8520321331 is about 92305.5866727470. The cubic root of 8520321331 is about 2042.4526225698.

Adding to 8520321331 its reverse (1331230258), we get a palindrome (9851551589).

The spelling of 8520321331 in words is "eight billion, five hundred twenty million, three hundred twenty-one thousand, three hundred thirty-one".