1231534530181 has 2 divisors, whose sum is σ = 1231534530182. Its totient is φ = 1231534530180.

The previous prime is 1231534530103. The next prime is 1231534530217. The reversal of 1231534530181 is 1810354351321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1210033000225 + 21501529956 = 1100015^2 + 146634^2 .

It is an emirp because it is prime and its reverse (1810354351321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231534530181 - 2¹³ = 1231534521989 is a prime.

It is a super-2 number, since 2×1231534530181² (a number of 25 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 1231534530181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231534531181) 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, 615767265090 + 615767265091.

It is an arithmetic number, because the mean of its divisors is an integer number (615767265091).

Almost surely, 2^{1231534530181} is an apocalyptic number.

It is an amenable number.

1231534530181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231534530181 is an equidigital number, since it uses as much as digits as its factorization.

1231534530181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 37.

The spelling of 1231534530181 in words is "one trillion, two hundred thirty-one billion, five hundred thirty-four million, five hundred thirty thousand, one hundred eighty-one".