9976959521 has 4 divisors (see below), whose sum is σ = 9977599044. Its totient is φ = 9976320000.

The previous prime is 9976959511. The next prime is 9976959539. The reversal of 9976959521 is 1259596799.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1259596799 = 439 ⋅2869241.

It can be written as a sum of positive squares in 2 ways, for example, as 4180269025 + 5796690496 = 64655^2 + 76136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9976959521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9976959511) 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, 295760 + ... + 327761.

It is an arithmetic number, because the mean of its divisors is an integer number (2494399761).

Almost surely, 2^9976959521 is an apocalyptic number.

It is an amenable number.

9976959521 is a deficient number, since it is larger than the sum of its proper divisors (639523).

9976959521 is a wasteful number, since it uses less digits than its factorization.

9976959521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639522.

The product of its digits is 13778100, while the sum is 62.

The square root of 9976959521 is about 99884.7311704847. The cubic root of 9976959521 is about 2152.7787773715.

The spelling of 9976959521 in words is "nine billion, nine hundred seventy-six million, nine hundred fifty-nine thousand, five hundred twenty-one".