9913591 has 4 divisors (see below), whose sum is σ = 9920232. Its totient is φ = 9906952.

The previous prime is 9913571. The next prime is 9913609. The reversal of 9913591 is 1953199.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1953199 = 41 ⋅47639.

It is a cyclic number.

It is not a de Polignac number, because 9913591 - 2⁵ = 9913559 is a prime.

It is a Duffinian number.

9913591 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 9913591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9913511) 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, 81 + ... + 4453.

It is an arithmetic number, because the mean of its divisors is an integer number (2480058).

Almost surely, 2^9913591 is an apocalyptic number.

9913591 is a deficient number, since it is larger than the sum of its proper divisors (6641).

9913591 is a wasteful number, since it uses less digits than its factorization.

9913591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6640.

The product of its digits is 10935, while the sum is 37.

The square root of 9913591 is about 3148.5855554518. The cubic root of 9913591 is about 214.8211312029.

The spelling of 9913591 in words is "nine million, nine hundred thirteen thousand, five hundred ninety-one".