13231765 has 4 divisors (see below), whose sum is σ = 15878124. Its totient is φ = 10585408.

The previous prime is 13231741. The next prime is 13231781. The reversal of 13231765 is 56713231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7969329 + 5262436 = 2823^2 + 2294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13231765 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 1323172 + ... + 1323181.

It is an arithmetic number, because the mean of its divisors is an integer number (3969531).

Almost surely, 2^13231765 is an apocalyptic number.

It is an amenable number.

13231765 is a deficient number, since it is larger than the sum of its proper divisors (2646359).

13231765 is an equidigital number, since it uses as much as digits as its factorization.

13231765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2646358.

The product of its digits is 3780, while the sum is 28.

The square root of 13231765 is about 3637.5493123805. The cubic root of 13231765 is about 236.5225720313.

Adding to 13231765 its reverse (56713231), we get a palindrome (69944996).

The spelling of 13231765 in words is "thirteen million, two hundred thirty-one thousand, seven hundred sixty-five".