13531865 has 8 divisors (see below), whose sum is σ = 16346688. Its totient is φ = 10753200.

The previous prime is 13531849. The next prime is 13531867. The reversal of 13531865 is 56813531.

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

It is not a de Polignac number, because 13531865 - 2⁴ = 13531849 is a prime.

It is a super-2 number, since 2×13531865² = 366222740756450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13531867) 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, 8207 + ... + 9716.

It is an arithmetic number, because the mean of its divisors is an integer number (2043336).

Almost surely, 2^13531865 is an apocalyptic number.

It is an amenable number.

13531865 is a deficient number, since it is larger than the sum of its proper divisors (2814823).

13531865 is a wasteful number, since it uses less digits than its factorization.

13531865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18079.

The product of its digits is 10800, while the sum is 32.

The square root of 13531865 is about 3678.5683356436. The cubic root of 13531865 is about 238.2973533093.

The spelling of 13531865 in words is "thirteen million, five hundred thirty-one thousand, eight hundred sixty-five".