9980521 has 8 divisors (see below), whose sum is σ = 10197824. Its totient is φ = 9765360.

The previous prime is 9980519. The next prime is 9980539. The reversal of 9980521 is 1250899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9980521 - 2¹ = 9980519 is a prime.

It is a super-2 number, since 2×9980521² = 199221598862882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9980021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11716 + ... + 12538.

It is an arithmetic number, because the mean of its divisors is an integer number (1274728).

Almost surely, 2^9980521 is an apocalyptic number.

It is an amenable number.

9980521 is a deficient number, since it is larger than the sum of its proper divisors (217303).

9980521 is a wasteful number, since it uses less digits than its factorization.

9980521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1071.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 9980521 is about 3159.1962585443. The cubic root of 9980521 is about 215.3034906314.

It can be divided in two parts, 9980 and 521, that added together give a palindrome (10501).

The spelling of 9980521 in words is "nine million, nine hundred eighty thousand, five hundred twenty-one".