9859025921 has 8 divisors (see below), whose sum is σ = 10133945640. Its totient is φ = 9587398912.

The previous prime is 9859025909. The next prime is 9859025983. The reversal of 9859025921 is 1295209589.

It can be written as a sum of positive squares in 4 ways, for example, as 2834071696 + 7024954225 = 53236^2 + 83815^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9859025921 is a prime.

It is a super-2 number, since 2×9859025921² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9859025921.

It is not an unprimeable number, because it can be changed into a prime (9859025521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 817106 + ... + 829083.

It is an arithmetic number, because the mean of its divisors is an integer number (1266743205).

Almost surely, 2^9859025921 is an apocalyptic number.

It is an amenable number.

9859025921 is a deficient number, since it is larger than the sum of its proper divisors (274919719).

9859025921 is a wasteful number, since it uses less digits than its factorization.

9859025921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1646355.

The product of its (nonzero) digits is 583200, while the sum is 50.

The square root of 9859025921 is about 99292.6277273394. The cubic root of 9859025921 is about 2144.2627583938.

The spelling of 9859025921 in words is "nine billion, eight hundred fifty-nine million, twenty-five thousand, nine hundred twenty-one".