1311121311 has 8 divisors (see below), whose sum is σ = 1850994864. Its totient is φ = 822664320.

The previous prime is 1311121303. The next prime is 1311121313. The reversal of 1311121311 is 1131211131.

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

It is not a de Polignac number, because 1311121311 - 2³ = 1311121303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311121313) 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, 12854080 + ... + 12854181.

It is an arithmetic number, because the mean of its divisors is an integer number (231374358).

Almost surely, 2^1311121311 is an apocalyptic number.

1311121311 is a deficient number, since it is larger than the sum of its proper divisors (539873553).

1311121311 is a wasteful number, since it uses less digits than its factorization.

1311121311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25708281.

The product of its digits is 18, while the sum is 15.

The square root of 1311121311 is about 36209.4091501090. The cubic root of 1311121311 is about 1094.4962859078.

Adding to 1311121311 its reverse (1131211131), we get a palindrome (2442332442).

The spelling of 1311121311 in words is "one billion, three hundred eleven million, one hundred twenty-one thousand, three hundred eleven".