1311204144 has 80 divisors (see below), whose sum is σ = 3553701120. Its totient is φ = 416021760.

The previous prime is 1311204143. The next prime is 1311204161. The reversal of 1311204144 is 4414021131.

It is a self number, because there is not a number n which added to its sum of digits gives 1311204144.

It is not an unprimeable number, because it can be changed into a prime (1311204143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92199 + ... + 105465.

It is an arithmetic number, because the mean of its divisors is an integer number (44421264).

Almost surely, 2^1311204144 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 1311204144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1776850560).

1311204144 is an abundant number, since it is smaller than the sum of its proper divisors (2242496976).

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

1311204144 is a wasteful number, since it uses less digits than its factorization.

1311204144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13378 (or 13372 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1311204144 is about 36210.5529369547. The cubic root of 1311204144 is about 1094.5193345001.

Adding to 1311204144 its reverse (4414021131), we get a palindrome (5725225275).

The spelling of 1311204144 in words is "one billion, three hundred eleven million, two hundred four thousand, one hundred forty-four".