13151665 has 4 divisors (see below), whose sum is σ = 15782004. Its totient is φ = 10521328.

The previous prime is 13151651. The next prime is 13151669. The reversal of 13151665 is 56615131.

13151665 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.

It can be written as a sum of positive squares in 2 ways, for example, as 8520561 + 4631104 = 2919^2 + 2152^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13151665 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13151669) 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, 1315162 + ... + 1315171.

It is an arithmetic number, because the mean of its divisors is an integer number (3945501).

Almost surely, 2^13151665 is an apocalyptic number.

It is an amenable number.

13151665 is a deficient number, since it is larger than the sum of its proper divisors (2630339).

13151665 is an equidigital number, since it uses as much as digits as its factorization.

13151665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2630338.

The product of its digits is 2700, while the sum is 28.

The square root of 13151665 is about 3626.5224389213. The cubic root of 13151665 is about 236.0443335749.

Adding to 13151665 its reverse (56615131), we get a palindrome (69766796).

The spelling of 13151665 in words is "thirteen million, one hundred fifty-one thousand, six hundred sixty-five".