1311305 has 4 divisors (see below), whose sum is σ = 1573572. Its totient is φ = 1049040.

The previous prime is 1311301. The next prime is 1311307. The reversal of 1311305 is 5031131.

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 727609 + 583696 = 853^2 + 764^2 .

It is not a de Polignac number, because 1311305 - 2² = 1311301 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311305.

It is not an unprimeable number, because it can be changed into a prime (1311301) 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, 131126 + ... + 131135.

It is an arithmetic number, because the mean of its divisors is an integer number (393393).

2^1311305 is an apocalyptic number.

It is an amenable number.

1311305 is a deficient number, since it is larger than the sum of its proper divisors (262267).

1311305 is an equidigital number, since it uses as much as digits as its factorization.

1311305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262266.

The product of its (nonzero) digits is 45, while the sum is 14.

The square root of 1311305 is about 1145.1222642146. The cubic root of 1311305 is about 109.4547396749.

Adding to 1311305 its reverse (5031131), we get a palindrome (6342436).

The spelling of 1311305 in words is "one million, three hundred eleven thousand, three hundred five".