9691661 has 12 divisors (see below), whose sum is σ = 11414592. Its totient is φ = 8203608.

The previous prime is 9691639. The next prime is 9691673. The reversal of 9691661 is 1661969.

It is not a de Polignac number, because 9691661 - 2¹⁴ = 9675277 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9691061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2876 + ... + 5258.

It is an arithmetic number, because the mean of its divisors is an integer number (951216).

Almost surely, 2^9691661 is an apocalyptic number.

It is an amenable number.

9691661 is a deficient number, since it is larger than the sum of its proper divisors (1722931).

9691661 is a wasteful number, since it uses less digits than its factorization.

9691661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480 (or 2473 counting only the distinct ones).

The product of its digits is 17496, while the sum is 38.

The square root of 9691661 is about 3113.1432668607. The cubic root of 9691661 is about 213.2059914399.

The spelling of 9691661 in words is "nine million, six hundred ninety-one thousand, six hundred sixty-one".