1311022116 has 144 divisors (see below), whose sum is σ = 3813788160. Its totient is φ = 376980480.

The previous prime is 1311022061. The next prime is 1311022123. The reversal of 1311022116 is 6112201131.

It is a super-2 number, since 2×1311022116² = 3437557977282234912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 358650 + ... + 362286.

It is an arithmetic number, because the mean of its divisors is an integer number (26484640).

Almost surely, 2^1311022116 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311022116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1906894080).

1311022116 is an abundant number, since it is smaller than the sum of its proper divisors (2502766044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311022116 is a wasteful number, since it uses less digits than its factorization.

1311022116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3714 (or 3709 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1311022116 is about 36208.0393835402. The cubic root of 1311022116 is about 1094.4686832503.

Adding to 1311022116 its reverse (6112201131), we get a palindrome (7423223247).

The spelling of 1311022116 in words is "one billion, three hundred eleven million, twenty-two thousand, one hundred sixteen".