1311124115561 has 8 divisors (see below), whose sum is σ = 1412132050560. Its totient is φ = 1210137928272.

The previous prime is 1311124115503. The next prime is 1311124115573. The reversal of 1311124115561 is 1655114211131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1311124115561 is a prime.

It is a super-2 number, since 2×1311124115561² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1311124115461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5311601 + ... + 5552958.

It is an arithmetic number, because the mean of its divisors is an integer number (176516506320).

Almost surely, 2^{1311124115561} is an apocalyptic number.

It is an amenable number.

1311124115561 is a deficient number, since it is larger than the sum of its proper divisors (101007934999).

1311124115561 is a wasteful number, since it uses less digits than its factorization.

1311124115561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10873855.

The product of its digits is 3600, while the sum is 32.

Adding to 1311124115561 its reverse (1655114211131), we get a palindrome (2966238326692).

The spelling of 1311124115561 in words is "one trillion, three hundred eleven billion, one hundred twenty-four million, one hundred fifteen thousand, five hundred sixty-one".