111211123130531 has 2 divisors, whose sum is σ = 111211123130532. Its totient is φ = 111211123130530.

The previous prime is 111211123130501. The next prime is 111211123130543. The reversal of 111211123130531 is 135031321112111.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111211123130531 - 2¹⁰ = 111211123129507 is a prime.

It is a super-2 number, since 2×111211123130531² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111211123130531.

It is not a weakly prime, because it can be changed into another prime (111211123130501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55605561565265 + 55605561565266.

It is an arithmetic number, because the mean of its divisors is an integer number (55605561565266).

Almost surely, 2^{111211123130531} is an apocalyptic number.

111211123130531 is a deficient number, since it is larger than the sum of its proper divisors (1).

111211123130531 is an equidigital number, since it uses as much as digits as its factorization.

111211123130531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 26.

Adding to 111211123130531 its reverse (135031321112111), we get a palindrome (246242444242642).

The spelling of 111211123130531 in words is "one hundred eleven trillion, two hundred eleven billion, one hundred twenty-three million, one hundred thirty thousand, five hundred thirty-one".