1311431203400 has 48 divisors (see below), whose sum is σ = 3052198859940. Its totient is φ = 524035481600.

The previous prime is 1311431203363. The next prime is 1311431203421. The reversal of 1311431203400 is 43021341131.

It can be written as a sum of positive squares in 6 ways, for example, as 529136946724 + 782294256676 = 727418^2 + 884474^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3160361 + ... + 3551160.

Almost surely, 2^{1311431203400} is an apocalyptic number.

1311431203400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311431203400 is an abundant number, since it is smaller than the sum of its proper divisors (1740767656540).

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

1311431203400 is a wasteful number, since it uses less digits than its factorization.

1311431203400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6712514 (or 6712505 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1311431203400 its reverse (43021341131), we get a palindrome (1354452544531).

The spelling of 1311431203400 in words is "one trillion, three hundred eleven billion, four hundred thirty-one million, two hundred three thousand, four hundred".