2643821689 has 2 divisors, whose sum is σ = 2643821690. Its totient is φ = 2643821688.

The previous prime is 2643821651. The next prime is 2643821693. The reversal of 2643821689 is 9861283462.

2643821689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2560866025 + 82955664 = 50605^2 + 9108^2 .

It is a cyclic number.

It is not a de Polignac number, because 2643821689 - 2¹⁵ = 2643788921 is a prime.

It is not a weakly prime, because it can be changed into another prime (2643821699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321910844 + 1321910845.

It is an arithmetic number, because the mean of its divisors is an integer number (1321910845).

Almost surely, 2^2643821689 is an apocalyptic number.

It is an amenable number.

2643821689 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643821689 is an equidigital number, since it uses as much as digits as its factorization.

2643821689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 49.

The square root of 2643821689 is about 51418.1066259737. The cubic root of 2643821689 is about 1382.7512307280.

The spelling of 2643821689 in words is "two billion, six hundred forty-three million, eight hundred twenty-one thousand, six hundred eighty-nine".