9889526521 has 4 divisors (see below), whose sum is σ = 11302316032. Its totient is φ = 8476737012.

The previous prime is 9889526513. The next prime is 9889526531. The reversal of 9889526521 is 1256259889.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9889526521 - 2³ = 9889526513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9889526531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 706394745 + ... + 706394758.

It is an arithmetic number, because the mean of its divisors is an integer number (2825579008).

Almost surely, 2^9889526521 is an apocalyptic number.

It is an amenable number.

9889526521 is a deficient number, since it is larger than the sum of its proper divisors (1412789511).

9889526521 is a wasteful number, since it uses less digits than its factorization.

9889526521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412789510.

The product of its digits is 3110400, while the sum is 55.

The square root of 9889526521 is about 99446.0985710350. The cubic root of 9889526521 is about 2146.4716978124.

The spelling of 9889526521 in words is "nine billion, eight hundred eighty-nine million, five hundred twenty-six thousand, five hundred twenty-one".