1311561124031 has 16 divisors (see below), whose sum is σ = 1370561896704. Its totient is φ = 1252726098624.

The previous prime is 1311561124021. The next prime is 1311561124061. The reversal of 1311561124031 is 1304211651131.

It is a cyclic number.

It is not a de Polignac number, because 1311561124031 - 2¹⁰ = 1311561123007 is a prime.

It is a super-2 number, since 2×1311561124031² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1311561123985 and 1311561124003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311561124021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66086996 + ... + 66106838.

It is an arithmetic number, because the mean of its divisors is an integer number (85660118544).

Almost surely, 2^{1311561124031} is an apocalyptic number.

1311561124031 is a deficient number, since it is larger than the sum of its proper divisors (59000772673).

1311561124031 is a wasteful number, since it uses less digits than its factorization.

1311561124031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23870.

The product of its (nonzero) digits is 2160, while the sum is 29.

Adding to 1311561124031 its reverse (1304211651131), we get a palindrome (2615772775162).

The spelling of 1311561124031 in words is "one trillion, three hundred eleven billion, five hundred sixty-one million, one hundred twenty-four thousand, thirty-one".