1311329 has 4 divisors (see below), whose sum is σ = 1388484. Its totient is φ = 1234176.

The previous prime is 1311311. The next prime is 1311341. The reversal of 1311329 is 9231131.

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 1151329 + 160000 = 1073^2 + 400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311329 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1311329.

It is not an unprimeable number, because it can be changed into a prime (1311029) 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, 38552 + ... + 38585.

It is an arithmetic number, because the mean of its divisors is an integer number (347121).

2^1311329 is an apocalyptic number.

It is an amenable number.

1311329 is a deficient number, since it is larger than the sum of its proper divisors (77155).

1311329 is an equidigital number, since it uses as much as digits as its factorization.

1311329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77154.

The product of its digits is 162, while the sum is 20.

The square root of 1311329 is about 1145.1327433970. The cubic root of 1311329 is about 109.4554074315.

The spelling of 1311329 in words is "one million, three hundred eleven thousand, three hundred twenty-nine".