9591661 has 4 divisors (see below), whose sum is σ = 9601024. Its totient is φ = 9582300.

The previous prime is 9591649. The next prime is 9591683. The reversal of 9591661 is 1661959.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1661959 = 13 ⋅127843.

It is a cyclic number.

It is not a de Polignac number, because 9591661 - 2⁵ = 9591629 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a zygodrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 9591661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9591641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2925 + ... + 5266.

It is an arithmetic number, because the mean of its divisors is an integer number (2400256).

It is a Poulet number, since it divides 2^9591660-1.

Almost surely, 2^9591661 is an apocalyptic number.

It is an amenable number.

9591661 is a deficient number, since it is larger than the sum of its proper divisors (9363).

9591661 is a wasteful number, since it uses less digits than its factorization.

9591661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9362.

The product of its digits is 14580, while the sum is 37.

The square root of 9591661 is about 3097.0406842662. The cubic root of 9591661 is about 212.4701577470.

The spelling of 9591661 in words is "nine million, five hundred ninety-one thousand, six hundred sixty-one".