1311321400 has 24 divisors (see below), whose sum is σ = 3048822720. Its totient is φ = 524528480.

The previous prime is 1311321377. The next prime is 1311321439. The reversal of 1311321400 is 41231131.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3278104 + ... + 3278503.

It is an arithmetic number, because the mean of its divisors is an integer number (127034280).

Almost surely, 2^1311321400 is an apocalyptic number.

1311321400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311321400 is an abundant number, since it is smaller than the sum of its proper divisors (1737501320).

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

1311321400 is a wasteful number, since it uses less digits than its factorization.

1311321400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6556623 (or 6556614 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1311321400 is about 36212.1719867781. The cubic root of 1311321400 is about 1094.5519597614.

Adding to 1311321400 its reverse (41231131), we get a palindrome (1352552531).

The spelling of 1311321400 in words is "one billion, three hundred eleven million, three hundred twenty-one thousand, four hundred".