13811287 has 12 divisors (see below), whose sum is σ = 16251840. Its totient is φ = 11701536.

The previous prime is 13811269. The next prime is 13811297. The reversal of 13811287 is 78211831.

It is a happy number.

It is not a de Polignac number, because 13811287 - 2⁷ = 13811159 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 (13811207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2778 + ... + 5944.

It is an arithmetic number, because the mean of its divisors is an integer number (1354320).

Almost surely, 2^13811287 is an apocalyptic number.

13811287 is a deficient number, since it is larger than the sum of its proper divisors (2440553).

13811287 is an equidigital number, since it uses as much as digits as its factorization.

13811287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270 (or 3263 counting only the distinct ones).

The product of its digits is 2688, while the sum is 31.

The square root of 13811287 is about 3716.3539928268. The cubic root of 13811287 is about 239.9264068340.

The spelling of 13811287 in words is "thirteen million, eight hundred eleven thousand, two hundred eighty-seven".