8459867621 has 2 divisors, whose sum is σ = 8459867622. Its totient is φ = 8459867620.

The previous prime is 8459867609. The next prime is 8459867639. The reversal of 8459867621 is 1267689548.

It is a happy number.

8459867621 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., 6771479521 + 1688388100 = 82289^2 + 41090^2 .

It is a cyclic number.

It is not a de Polignac number, because 8459867621 - 2²⁶ = 8392758757 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8459867671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4229933810 + 4229933811.

It is an arithmetic number, because the mean of its divisors is an integer number (4229933811).

Almost surely, 2^8459867621 is an apocalyptic number.

It is an amenable number.

8459867621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8459867621 is an equidigital number, since it uses as much as digits as its factorization.

8459867621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5806080, while the sum is 56.

The square root of 8459867621 is about 91977.5386765704. The cubic root of 8459867621 is about 2037.6105899852.

The spelling of 8459867621 in words is "eight billion, four hundred fifty-nine million, eight hundred sixty-seven thousand, six hundred twenty-one".