9969 has 4 divisors (see below), whose sum is σ = 13296. Its totient is φ = 6644.

The previous prime is 9967. The next prime is 9973. The reversal of 9969 is 9699.

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 9969 - 2¹ = 9967 is a prime.

It is a super-2 number, since 2×9969² = 198761922, which contains 22 as substring.

It is a D-number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (9967) 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, 1659 + ... + 1664.

It is an arithmetic number, because the mean of its divisors is an integer number (3324).

2⁹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

9969 is a deficient number, since it is larger than the sum of its proper divisors (3327).

9969 is a wasteful number, since it uses less digits than its factorization.

9969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3326.

The product of its digits is 4374, while the sum is 33.

The square root of 9969 is about 99.8448796884. The cubic root of 9969 is about 21.5220613642.

The spelling of 9969 in words is "nine thousand, nine hundred sixty-nine".