9980561 has 4 divisors (see below), whose sum is σ = 10016112. Its totient is φ = 9945012.

The previous prime is 9980539. The next prime is 9980599. The reversal of 9980561 is 1650899.

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: 1650899 = 43 ⋅38393.

It is a cyclic number.

It is not a de Polignac number, because 9980561 - 2¹⁰ = 9979537 is a prime.

It is a super-2 number, since 2×9980561² = 199223195749442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9980461) 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, 17351 + ... + 17916.

It is an arithmetic number, because the mean of its divisors is an integer number (2504028).

Almost surely, 2^9980561 is an apocalyptic number.

It is an amenable number.

9980561 is a deficient number, since it is larger than the sum of its proper divisors (35551).

9980561 is a wasteful number, since it uses less digits than its factorization.

9980561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35550.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 9980561 is about 3159.2025892620. The cubic root of 9980561 is about 215.3037782626.

Adding to 9980561 its product of nonzero digits (19440), we get a palindrome (10000001).

The spelling of 9980561 in words is "nine million, nine hundred eighty thousand, five hundred sixty-one".