1311143221 has 8 divisors (see below), whose sum is σ = 1369644480. Its totient is φ = 1252766592.

The previous prime is 1311143209. The next prime is 1311143227. The reversal of 1311143221 is 1223411131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311143221 - 2⁵ = 1311143189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311143227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9315 + ... + 52048.

It is an arithmetic number, because the mean of its divisors is an integer number (171205560).

Almost surely, 2^1311143221 is an apocalyptic number.

It is an amenable number.

1311143221 is a deficient number, since it is larger than the sum of its proper divisors (58501259).

1311143221 is an equidigital number, since it uses as much as digits as its factorization.

1311143221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62315.

The product of its digits is 144, while the sum is 19.

The square root of 1311143221 is about 36209.7116945164. The cubic root of 1311143221 is about 1094.5023825417.

Adding to 1311143221 its reverse (1223411131), we get a palindrome (2534554352).

The spelling of 1311143221 in words is "one billion, three hundred eleven million, one hundred forty-three thousand, two hundred twenty-one".