9725312689 has 9 divisors (see below), whose sum is σ = 10332822721. Its totient is φ = 9151657600.

The previous prime is 9725312687. The next prime is 9725312717. The reversal of 9725312689 is 9862135279.

The square root of 9725312689 is 98617.

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

It can be written as a sum of positive squares in 4 ways, for example, as 6429634225 + 3295678464 = 80185^2 + 57408^2 .

It is not a de Polignac number, because 9725312689 - 2¹ = 9725312687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9725312687) 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, 1673589 + ... + 1679389.

Almost surely, 2^9725312689 is an apocalyptic number.

9725312689 is the 98617-th square number.

9725312689 is the 49309-th centered octagonal number.

It is an amenable number.

9725312689 is a deficient number, since it is larger than the sum of its proper divisors (607510032).

9725312689 is an frugal number, since it uses more digits than its factorization.

9725312689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11636 (or 5818 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 52.

The cubic root of 9725312689 is about 2134.5247322038.

The spelling of 9725312689 in words is "nine billion, seven hundred twenty-five million, three hundred twelve thousand, six hundred eighty-nine".