1231121111131 has 2 divisors, whose sum is σ = 1231121111132. Its totient is φ = 1231121111130.

The previous prime is 1231121111111. The next prime is 1231121111167. The reversal of 1231121111131 is 1311111211321.

It is a m-pointer prime, because the next prime (1231121111167) can be obtained adding 1231121111131 to its product of digits (36).

It is a weak prime.

It is an emirp because it is prime and its reverse (1311111211321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231121111131 - 2⁹ = 1231121110619 is a prime.

It is a super-2 number, since 2×1231121111131² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1231121111099 and 1231121111108.

It is not a weakly prime, because it can be changed into another prime (1231121111111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615560555565 + 615560555566.

It is an arithmetic number, because the mean of its divisors is an integer number (615560555566).

Almost surely, 2^{1231121111131} is an apocalyptic number.

1231121111131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231121111131 is an equidigital number, since it uses as much as digits as its factorization.

1231121111131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36, while the sum is 19.

Adding to 1231121111131 its reverse (1311111211321), we get a palindrome (2542232322452).

The spelling of 1231121111131 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-one million, one hundred eleven thousand, one hundred thirty-one".