1311440400243 has 12 divisors (see below), whose sum is σ = 1959623586960. Its totient is φ = 844145544816.

The previous prime is 1311440400203. The next prime is 1311440400299. The reversal of 1311440400243 is 3420040441131.

1311440400243 is a `hidden beast` number, since 1 + 3 + 1 + 14 + 4 + 0 + 400 + 243 = 666.

It is not a de Polignac number, because 1311440400243 - 2⁸ = 1311440399987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311440400203) 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, 2512337671 + ... + 2512338192.

It is an arithmetic number, because the mean of its divisors is an integer number (163301965580).

Almost surely, 2^{1311440400243} is an apocalyptic number.

1311440400243 is a deficient number, since it is larger than the sum of its proper divisors (648183186717).

1311440400243 is a wasteful number, since it uses less digits than its factorization.

1311440400243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5024675898 (or 5024675895 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 1311440400243 its reverse (3420040441131), we get a palindrome (4731480841374).

The spelling of 1311440400243 in words is "one trillion, three hundred eleven billion, four hundred forty million, four hundred thousand, two hundred forty-three".