1311434209 has 4 divisors (see below), whose sum is σ = 1317062916. Its totient is φ = 1305805504.

The previous prime is 1311434177. The next prime is 1311434219. The reversal of 1311434209 is 9024341131.

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 579461184 + 731973025 = 24072^2 + 27055^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311434209 - 2⁵ = 1311434177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311434219) 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, 2814004 + ... + 2814469.

It is an arithmetic number, because the mean of its divisors is an integer number (329265729).

Almost surely, 2^1311434209 is an apocalyptic number.

It is an amenable number.

1311434209 is a deficient number, since it is larger than the sum of its proper divisors (5628707).

1311434209 is an equidigital number, since it uses as much as digits as its factorization.

1311434209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5628706.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1311434209 is about 36213.7295649040. The cubic root of 1311434209 is about 1094.5833458558.

The spelling of 1311434209 in words is "one billion, three hundred eleven million, four hundred thirty-four thousand, two hundred nine".