6459886921 has 2 divisors, whose sum is σ = 6459886922. Its totient is φ = 6459886920.

The previous prime is 6459886903. The next prime is 6459886949. The reversal of 6459886921 is 1296889546.

6459886921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6274382521 + 185504400 = 79211^2 + 13620^2 .

It is a cyclic number.

It is not a de Polignac number, because 6459886921 - 2¹⁷ = 6459755849 is a prime.

It is not a weakly prime, because it can be changed into another prime (6459887921) 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, 3229943460 + 3229943461.

It is an arithmetic number, because the mean of its divisors is an integer number (3229943461).

Almost surely, 2^6459886921 is an apocalyptic number.

It is an amenable number.

6459886921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6459886921 is an equidigital number, since it uses as much as digits as its factorization.

6459886921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7464960, while the sum is 58.

The square root of 6459886921 is about 80373.4217325603. The cubic root of 6459886921 is about 1862.4086151640.

The spelling of 6459886921 in words is "six billion, four hundred fifty-nine million, eight hundred eighty-six thousand, nine hundred twenty-one".