9981264641 has 4 divisors (see below), whose sum is σ = 10002822912. Its totient is φ = 9959706372.

The previous prime is 9981264617. The next prime is 9981264653. The reversal of 9981264641 is 1464621899.

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 9981264641 - 2⁶ = 9981264577 is a prime.

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 9981264641.

It is not an unprimeable number, because it can be changed into a prime (9981264611) 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 3 ways as a sum of consecutive naturals, for example, 10778441 + ... + 10779366.

It is an arithmetic number, because the mean of its divisors is an integer number (2500705728).

Almost surely, 2^9981264641 is an apocalyptic number.

It is an amenable number.

9981264641 is a deficient number, since it is larger than the sum of its proper divisors (21558271).

9981264641 is a wasteful number, since it uses less digits than its factorization.

9981264641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21558270.

The product of its digits is 746496, while the sum is 50.

The square root of 9981264641 is about 99906.2792871399. The cubic root of 9981264641 is about 2153.0883786486.

The spelling of 9981264641 in words is "nine billion, nine hundred eighty-one million, two hundred sixty-four thousand, six hundred forty-one".