13561871 has 4 divisors (see below), whose sum is σ = 13576200. Its totient is φ = 13547544.

The previous prime is 13561859. The next prime is 13561883. The reversal of 13561871 is 17816531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17816531 = 83 ⋅214657.

It is an interprime number because it is at equal distance from previous prime (13561859) and next prime (13561883).

It is a cyclic number.

It is not a de Polignac number, because 13561871 - 2¹⁰ = 13560847 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 (13561841) 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, 5636 + ... + 7673.

It is an arithmetic number, because the mean of its divisors is an integer number (3394050).

Almost surely, 2^13561871 is an apocalyptic number.

13561871 is a deficient number, since it is larger than the sum of its proper divisors (14329).

13561871 is a wasteful number, since it uses less digits than its factorization.

13561871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14328.

The product of its digits is 5040, while the sum is 32.

The square root of 13561871 is about 3682.6445660693. The cubic root of 13561871 is about 238.4733593943.

The spelling of 13561871 in words is "thirteen million, five hundred sixty-one thousand, eight hundred seventy-one".