2131110231181 has 2 divisors, whose sum is σ = 2131110231182. Its totient is φ = 2131110231180.

The previous prime is 2131110231119. The next prime is 2131110231191. The reversal of 2131110231181 is 1811320111312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2087039626281 + 44070604900 = 1444659^2 + 209930^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131110231181 - 2²⁵ = 2131076676749 is a prime.

It is a super-2 number, since 2×2131110231181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131110231191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065555115590 + 1065555115591.

It is an arithmetic number, because the mean of its divisors is an integer number (1065555115591).

Almost surely, 2^{2131110231181} is an apocalyptic number.

It is an amenable number.

2131110231181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131110231181 is an equidigital number, since it uses as much as digits as its factorization.

2131110231181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

Adding to 2131110231181 its reverse (1811320111312), we get a palindrome (3942430342493).

The spelling of 2131110231181 in words is "two trillion, one hundred thirty-one billion, one hundred ten million, two hundred thirty-one thousand, one hundred eighty-one".