13431665 has 8 divisors (see below), whose sum is σ = 17357928. Its totient is φ = 9918720.

The previous prime is 13431661. The next prime is 13431667. The reversal of 13431665 is 56613431.

It is a happy number.

13431665 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 478864 + 12952801 = 692^2 + 3599^2 .

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

It is not a de Polignac number, because 13431665 - 2² = 13431661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13431661) 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, 103256 + ... + 103385.

It is an arithmetic number, because the mean of its divisors is an integer number (2169741).

Almost surely, 2^13431665 is an apocalyptic number.

It is an amenable number.

13431665 is a deficient number, since it is larger than the sum of its proper divisors (3926263).

13431665 is a wasteful number, since it uses less digits than its factorization.

13431665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206659.

The product of its digits is 6480, while the sum is 29.

The square root of 13431665 is about 3664.9236008408. The cubic root of 13431665 is about 237.7077185525.

The spelling of 13431665 in words is "thirteen million, four hundred thirty-one thousand, six hundred sixty-five".