9661689 has 6 divisors (see below), whose sum is σ = 13955786. Its totient is φ = 6441120.

The previous prime is 9661681. The next prime is 9661693. The reversal of 9661689 is 9861669.

It can be written as a sum of positive squares in only one way, i.e., 9659664 + 2025 = 3108^2 + 45^2 .

It is not a de Polignac number, because 9661689 - 2³ = 9661681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9661681) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 536752 + ... + 536769.

Almost surely, 2^9661689 is an apocalyptic number.

It is an amenable number.

9661689 is a deficient number, since it is larger than the sum of its proper divisors (4294097).

9661689 is a wasteful number, since it uses less digits than its factorization.

9661689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073527 (or 1073524 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 9661689 is about 3108.3257551293. The cubic root of 9661689 is about 212.9859806947.

The spelling of 9661689 in words is "nine million, six hundred sixty-one thousand, six hundred eighty-nine".