13808561 has 4 divisors (see below), whose sum is σ = 14870772. Its totient is φ = 12746352.

The previous prime is 13808551. The next prime is 13808593. The reversal of 13808561 is 16580831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16580831 = 17 ⋅975343.

It can be written as a sum of positive squares in 2 ways, for example, as 4080400 + 9728161 = 2020^2 + 3119^2 .

It is a cyclic number.

It is not a de Polignac number, because 13808561 - 2¹⁸ = 13546417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13808551) 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, 531086 + ... + 531111.

It is an arithmetic number, because the mean of its divisors is an integer number (3717693).

Almost surely, 2^13808561 is an apocalyptic number.

It is an amenable number.

13808561 is a deficient number, since it is larger than the sum of its proper divisors (1062211).

13808561 is a wasteful number, since it uses less digits than its factorization.

13808561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062210.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 13808561 is about 3715.9872174161. The cubic root of 13808561 is about 239.9106206532.

The spelling of 13808561 in words is "thirteen million, eight hundred eight thousand, five hundred sixty-one".