13431365 has 4 divisors (see below), whose sum is σ = 16117644. Its totient is φ = 10745088.

The previous prime is 13431361. The next prime is 13431371. The reversal of 13431365 is 56313431.

13431365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56313431 = 61 ⋅923171.

It can be written as a sum of positive squares in 2 ways, for example, as 2979076 + 10452289 = 1726^2 + 3233^2 .

It is a cyclic number.

It is not a de Polignac number, because 13431365 - 2² = 13431361 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 (13431361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1343132 + ... + 1343141.

It is an arithmetic number, because the mean of its divisors is an integer number (4029411).

Almost surely, 2^13431365 is an apocalyptic number.

It is an amenable number.

13431365 is a deficient number, since it is larger than the sum of its proper divisors (2686279).

13431365 is an equidigital number, since it uses as much as digits as its factorization.

13431365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2686278.

The product of its digits is 3240, while the sum is 26.

The square root of 13431365 is about 3664.8826720647. The cubic root of 13431365 is about 237.7059487831.

Adding to 13431365 its reverse (56313431), we get a palindrome (69744796).

The spelling of 13431365 in words is "thirteen million, four hundred thirty-one thousand, three hundred sixty-five".