13855591 has 8 divisors (see below), whose sum is σ = 14957280. Its totient is φ = 12795552.

The previous prime is 13855559. The next prime is 13855607. The reversal of 13855591 is 19555831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13855591 - 2⁵ = 13855559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13855591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13850591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9720 + ... + 11053.

It is an arithmetic number, because the mean of its divisors is an integer number (1869660).

Almost surely, 2^13855591 is an apocalyptic number.

13855591 is a deficient number, since it is larger than the sum of its proper divisors (1101689).

13855591 is a wasteful number, since it uses less digits than its factorization.

13855591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20825.

The product of its digits is 27000, while the sum is 37.

The square root of 13855591 is about 3722.3099011232. The cubic root of 13855591 is about 240.1826792030.

The spelling of 13855591 in words is "thirteen million, eight hundred fifty-five thousand, five hundred ninety-one".