9980703521 has 4 divisors (see below), whose sum is σ = 10073981232. Its totient is φ = 9887425812.

The previous prime is 9980703497. The next prime is 9980703529. The reversal of 9980703521 is 1253070899.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1253070899 = 113 ⋅11089123.

It is a cyclic number.

It is not a de Polignac number, because 9980703521 - 2¹⁰ = 9980702497 is a prime.

It is a super-2 number, since 2×9980703521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9980703529) 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, 46638695 + ... + 46638908.

It is an arithmetic number, because the mean of its divisors is an integer number (2518495308).

Almost surely, 2^9980703521 is an apocalyptic number.

It is an amenable number.

9980703521 is a deficient number, since it is larger than the sum of its proper divisors (93277711).

9980703521 is a wasteful number, since it uses less digits than its factorization.

9980703521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93277710.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 9980703521 is about 99903.4710157760. The cubic root of 9980703521 is about 2153.0480309360.

The spelling of 9980703521 in words is "nine billion, nine hundred eighty million, seven hundred three thousand, five hundred twenty-one".