1311215331 has 8 divisors (see below), whose sum is σ = 1748459520. Its totient is φ = 874057352.

The previous prime is 1311215317. The next prime is 1311215369. The reversal of 1311215331 is 1335121131.

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 1311215331 - 2⁷ = 1311215203 is a prime.

It is a super-2 number, since 2×1311215331² = 3438571288498879122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1311215298 and 1311215307.

It is not an unprimeable number, because it can be changed into a prime (1311215231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35566 + ... + 62348.

It is an arithmetic number, because the mean of its divisors is an integer number (218557440).

Almost surely, 2^1311215331 is an apocalyptic number.

1311215331 is a deficient number, since it is larger than the sum of its proper divisors (437244189).

1311215331 is a wasteful number, since it uses less digits than its factorization.

1311215331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43105.

The product of its digits is 270, while the sum is 21.

The square root of 1311215331 is about 36210.7074081687. The cubic root of 1311215331 is about 1094.5224472503.

Adding to 1311215331 its reverse (1335121131), we get a palindrome (2646336462).

The spelling of 1311215331 in words is "one billion, three hundred eleven million, two hundred fifteen thousand, three hundred thirty-one".