1311231562011 has 24 divisors (see below), whose sum is σ = 2188893788640. Its totient is φ = 740856352896.

The previous prime is 1311231561979. The next prime is 1311231562019. The reversal of 1311231562011 is 1102651321131.

1311231562011 is a `hidden beast` number, since 1 + 3 + 1 + 1 + 2 + 31 + 5 + 620 + 1 + 1 = 666.

It is not a de Polignac number, because 1311231562011 - 2⁵ = 1311231561979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1311231562019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116922480 + ... + 116933693.

It is an arithmetic number, because the mean of its divisors is an integer number (91203907860).

Almost surely, 2^{1311231562011} is an apocalyptic number.

1311231562011 is a deficient number, since it is larger than the sum of its proper divisors (877662226629).

1311231562011 is a wasteful number, since it uses less digits than its factorization.

1311231562011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233856275 (or 233856272 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

Adding to 1311231562011 its reverse (1102651321131), we get a palindrome (2413882883142).

The spelling of 1311231562011 in words is "one trillion, three hundred eleven billion, two hundred thirty-one million, five hundred sixty-two thousand, eleven".