1311444220 has 48 divisors (see below), whose sum is σ = 2902112640. Its totient is φ = 496431936.

The previous prime is 1311444203. The next prime is 1311444223. The reversal of 1311444220 is 224441131.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1311444191 and 1311444200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311444223) 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, 653739 + ... + 655741.

It is an arithmetic number, because the mean of its divisors is an integer number (60460680).

Almost surely, 2^1311444220 is an apocalyptic number.

1311444220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311444220 is an abundant number, since it is smaller than the sum of its proper divisors (1590668420).

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

1311444220 is a wasteful number, since it uses less digits than its factorization.

1311444220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3754 (or 3752 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1311444220 is about 36213.8677856978. The cubic root of 1311444220 is about 1094.5861310624.

Adding to 1311444220 its reverse (224441131), we get a palindrome (1535885351).

The spelling of 1311444220 in words is "one billion, three hundred eleven million, four hundred forty-four thousand, two hundred twenty".