11311212111131 has 2 divisors, whose sum is σ = 11311212111132. Its totient is φ = 11311212111130.

The previous prime is 11311212111113. The next prime is 11311212111167. The reversal of 11311212111131 is 13111121211311.

Together with previous prime (11311212111113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a m-pointer prime, because the next prime (11311212111167) can be obtained adding 11311212111131 to its product of digits (36).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11311212111131 is a prime.

It is a super-2 number, since 2×11311212111131² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11311212111431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5655606055565 + 5655606055566.

It is an arithmetic number, because the mean of its divisors is an integer number (5655606055566).

Almost surely, 2^{11311212111131} is an apocalyptic number.

11311212111131 is a deficient number, since it is larger than the sum of its proper divisors (1).

11311212111131 is an equidigital number, since it uses as much as digits as its factorization.

11311212111131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 20.

Adding to 11311212111131 its reverse (13111121211311), we get a palindrome (24422333322442).

The spelling of 11311212111131 in words is "eleven trillion, three hundred eleven billion, two hundred twelve million, one hundred eleven thousand, one hundred thirty-one".