431321308681 has 2 divisors, whose sum is σ = 431321308682. Its totient is φ = 431321308680.

The previous prime is 431321308673. The next prime is 431321308699. The reversal of 431321308681 is 186803123134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 369274982400 + 62046326281 = 607680^2 + 249091^2 .

It is a cyclic number.

It is not a de Polignac number, because 431321308681 - 2³ = 431321308673 is a prime.

It is a super-2 number, since 2×431321308681² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (431321308651) 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 as a sum of consecutive naturals, namely, 215660654340 + 215660654341.

It is an arithmetic number, because the mean of its divisors is an integer number (215660654341).

Almost surely, 2^431321308681 is an apocalyptic number.

It is an amenable number.

431321308681 is a deficient number, since it is larger than the sum of its proper divisors (1).

431321308681 is an equidigital number, since it uses as much as digits as its factorization.

431321308681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 431321308681 in words is "four hundred thirty-one billion, three hundred twenty-one million, three hundred eight thousand, six hundred eighty-one".