9656591 has 4 divisors (see below), whose sum is σ = 11036112. Its totient is φ = 8277072.

The previous prime is 9656587. The next prime is 9656611. The reversal of 9656591 is 1956569.

9656591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1956569 = 1213 ⋅1613.

It is a cyclic number.

It is not a de Polignac number, because 9656591 - 2² = 9656587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9656501) 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, 689750 + ... + 689763.

It is an arithmetic number, because the mean of its divisors is an integer number (2759028).

Almost surely, 2^9656591 is an apocalyptic number.

9656591 is a deficient number, since it is larger than the sum of its proper divisors (1379521).

9656591 is a wasteful number, since it uses less digits than its factorization.

9656591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379520.

The product of its digits is 72900, while the sum is 41.

The square root of 9656591 is about 3107.5055913063. The cubic root of 9656591 is about 212.9485133478.

The spelling of 9656591 in words is "nine million, six hundred fifty-six thousand, five hundred ninety-one".