9965591 has 4 divisors (see below), whose sum is σ = 10007184. Its totient is φ = 9924000.

The previous prime is 9965581. The next prime is 9965603. The reversal of 9965591 is 1955699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1955699 = 131 ⋅14929.

It is a cyclic number.

It is not a de Polignac number, because 9965591 - 2²² = 5771287 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 (9965581) 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, 20435 + ... + 20916.

It is an arithmetic number, because the mean of its divisors is an integer number (2501796).

Almost surely, 2^9965591 is an apocalyptic number.

9965591 is a deficient number, since it is larger than the sum of its proper divisors (41593).

9965591 is a wasteful number, since it uses less digits than its factorization.

9965591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41592.

The product of its digits is 109350, while the sum is 44.

The square root of 9965591 is about 3156.8324314097. The cubic root of 9965591 is about 215.1960785598.

The spelling of 9965591 in words is "nine million, nine hundred sixty-five thousand, five hundred ninety-one".