131211545112161 has 2 divisors, whose sum is σ = 131211545112162. Its totient is φ = 131211545112160.

The previous prime is 131211545112083. The next prime is 131211545112187. The reversal of 131211545112161 is 161211545112131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90201366553600 + 41010178558561 = 9497440^2 + 6403919^2 .

It is a cyclic number.

It is not a de Polignac number, because 131211545112161 - 2²² = 131211540917857 is a prime.

It is a super-2 number, since 2×131211545112161² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131211545114161) 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, 65605772556080 + 65605772556081.

It is an arithmetic number, because the mean of its divisors is an integer number (65605772556081).

Almost surely, 2^{131211545112161} is an apocalyptic number.

It is an amenable number.

131211545112161 is a deficient number, since it is larger than the sum of its proper divisors (1).

131211545112161 is an equidigital number, since it uses as much as digits as its factorization.

131211545112161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7200, while the sum is 35.

The spelling of 131211545112161 in words is "one hundred thirty-one trillion, two hundred eleven billion, five hundred forty-five million, one hundred twelve thousand, one hundred sixty-one".