1313665 has 4 divisors (see below), whose sum is σ = 1576404. Its totient is φ = 1050928.

The previous prime is 1313657. The next prime is 1313677. The reversal of 1313665 is 5663131.

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 223729 + 1089936 = 473^2 + 1044^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313665 - 2³ = 1313657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131362 + ... + 131371.

It is an arithmetic number, because the mean of its divisors is an integer number (394101).

2^1313665 is an apocalyptic number.

It is an amenable number.

1313665 is a deficient number, since it is larger than the sum of its proper divisors (262739).

1313665 is an equidigital number, since it uses as much as digits as its factorization.

1313665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262738.

The product of its digits is 1620, while the sum is 25.

The square root of 1313665 is about 1146.1522586463. The cubic root of 1313665 is about 109.5203634557.

Adding to 1313665 its reverse (5663131), we get a palindrome (6976796).

The spelling of 1313665 in words is "one million, three hundred thirteen thousand, six hundred sixty-five".