1311331229 has 4 divisors (see below), whose sum is σ = 1412202876. Its totient is φ = 1210459584.

The previous prime is 1311331211. The next prime is 1311331237. The reversal of 1311331229 is 9221331131.

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 126112900 + 1185218329 = 11230^2 + 34427^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311331229 - 2²⁴ = 1294554013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311331198 and 1311331207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311331289) 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, 50435804 + ... + 50435829.

It is an arithmetic number, because the mean of its divisors is an integer number (353050719).

Almost surely, 2^1311331229 is an apocalyptic number.

It is an amenable number.

1311331229 is a deficient number, since it is larger than the sum of its proper divisors (100871647).

1311331229 is a wasteful number, since it uses less digits than its factorization.

1311331229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100871646.

The product of its digits is 972, while the sum is 26.

The square root of 1311331229 is about 36212.3077005595. The cubic root of 1311331229 is about 1094.5546944900.

The spelling of 1311331229 in words is "one billion, three hundred eleven million, three hundred thirty-one thousand, two hundred twenty-nine".