9906059521 has 4 divisors (see below), whose sum is σ = 9919077444. Its totient is φ = 9893041600.

The previous prime is 9906059491. The next prime is 9906059533. The reversal of 9906059521 is 1259506099.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4001827600 + 5904231921 = 63260^2 + 76839^2 .

It is a cyclic number.

It is not a de Polignac number, because 9906059521 - 2³¹ = 7758575873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9906059921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6507820 + ... + 6509341.

It is an arithmetic number, because the mean of its divisors is an integer number (2479769361).

Almost surely, 2^9906059521 is an apocalyptic number.

It is an amenable number.

9906059521 is a deficient number, since it is larger than the sum of its proper divisors (13017923).

9906059521 is a wasteful number, since it uses less digits than its factorization.

9906059521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13017922.

The product of its (nonzero) digits is 218700, while the sum is 46.

The square root of 9906059521 is about 99529.1892913833. The cubic root of 9906059521 is about 2147.6671665458.

The spelling of 9906059521 in words is "nine billion, nine hundred six million, fifty-nine thousand, five hundred twenty-one".