1311291329 has 4 divisors (see below), whose sum is σ = 1311486720. Its totient is φ = 1311095940.

The previous prime is 1311291307. The next prime is 1311291431. The reversal of 1311291329 is 9231921131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9231921131 = 769 ⋅12005099.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311291329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311291295 and 1311291304.

It is not an unprimeable number, because it can be changed into a prime (1311291029) 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, 87257 + ... + 101174.

It is an arithmetic number, because the mean of its divisors is an integer number (327871680).

Almost surely, 2^1311291329 is an apocalyptic number.

It is an amenable number.

1311291329 is a deficient number, since it is larger than the sum of its proper divisors (195391).

1311291329 is an equidigital number, since it uses as much as digits as its factorization.

1311291329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195390.

The product of its digits is 2916, while the sum is 32.

The square root of 1311291329 is about 36211.7567787038. The cubic root of 1311291329 is about 1094.5435930042.

The spelling of 1311291329 in words is "one billion, three hundred eleven million, two hundred ninety-one thousand, three hundred twenty-nine".