1311231444400 has 60 divisors (see below), whose sum is σ = 3287200244112. Its totient is φ = 501688549120.

The previous prime is 1311231444359. The next prime is 1311231444407. The reversal of 1311231444400 is 44441321131.

It is not an unprimeable number, because it can be changed into a prime (1311231444407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71253379 + ... + 71271778.

Almost surely, 2^{1311231444400} is an apocalyptic number.

1311231444400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311231444400 is an abundant number, since it is smaller than the sum of its proper divisors (1975968799712).

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

1311231444400 is a wasteful number, since it uses less digits than its factorization.

1311231444400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142525198 (or 142525187 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 1311231444400 its reverse (44441321131), we get a palindrome (1355672765531).

The spelling of 1311231444400 in words is "one trillion, three hundred eleven billion, two hundred thirty-one million, four hundred forty-four thousand, four hundred".