6861305889 has 9 divisors (see below), whose sum is σ = 9911134129. Its totient is φ = 4574038260.

The previous prime is 6861305861. The next prime is 6861305903. The reversal of 6861305889 is 9885031686.

The square root of 6861305889 is 82833.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 6861305889 - 2²¹ = 6859208737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6861305809) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 234694 + ... + 262304.

Almost surely, 2^6861305889 is an apocalyptic number.

6861305889 is the 82833-rd square number.

6861305889 is the 41417-th centered octagonal number.

It is an amenable number.

6861305889 is a deficient number, since it is larger than the sum of its proper divisors (3049828240).

6861305889 is an frugal number, since it uses more digits than its factorization.

6861305889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55228 (or 27614 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The cubic root of 6861305889 is about 1900.2128929499.

The spelling of 6861305889 in words is "six billion, eight hundred sixty-one million, three hundred five thousand, eight hundred eighty-nine".