9969561 has 24 divisors (see below), whose sum is σ = 17070144. Its totient is φ = 5695920.

The previous prime is 9969559. The next prime is 9969571. The reversal of 9969561 is 1659699.

9969561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9969561 - 2¹ = 9969559 is a prime.

It is a super-3 number, since 3×9969561³ (a number of 22 digits) contains 333 as substring.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9969551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1230 + ... + 4631.

It is an arithmetic number, because the mean of its divisors is an integer number (711256).

Almost surely, 2^9969561 is an apocalyptic number.

It is an amenable number.

9969561 is a deficient number, since it is larger than the sum of its proper divisors (7100583).

9969561 is an equidigital number, since it uses as much as digits as its factorization.

9969561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5883 (or 5871 counting only the distinct ones).

The product of its digits is 131220, while the sum is 45.

The square root of 9969561 is about 3157.4611636566. The cubic root of 9969561 is about 215.2246507073.

The spelling of 9969561 in words is "nine million, nine hundred sixty-nine thousand, five hundred sixty-one".