1311321100 has 72 divisors (see below), whose sum is σ = 3002585600. Its totient is φ = 495720000.

The previous prime is 1311321091. The next prime is 1311321127. The reversal of 1311321100 is 11231131.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1426441 + ... + 1427359.

Almost surely, 2^1311321100 is an apocalyptic number.

1311321100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311321100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1501292800).

1311321100 is an abundant number, since it is smaller than the sum of its proper divisors (1691264500).

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

1311321100 is a wasteful number, since it uses less digits than its factorization.

1311321100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1703 (or 1696 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1311321100 is about 36212.1678445243. The cubic root of 1311321100 is about 1094.5518762920.

Adding to 1311321100 its reverse (11231131), we get a palindrome (1322552231).

It can be divided in two parts, 131 and 1321100, that added together give a palindrome (1321231).

The spelling of 1311321100 in words is "one billion, three hundred eleven million, three hundred twenty-one thousand, one hundred".