131281169 has 2 divisors, whose sum is σ = 131281170. Its totient is φ = 131281168.

The previous prime is 131281099. The next prime is 131281181. The reversal of 131281169 is 961182131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121440400 + 9840769 = 11020^2 + 3137^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131281169 is a prime.

It is a super-2 number, since 2×131281169² = 34469490668013122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131281369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65640584 + 65640585.

It is an arithmetic number, because the mean of its divisors is an integer number (65640585).

Almost surely, 2^131281169 is an apocalyptic number.

It is an amenable number.

131281169 is a deficient number, since it is larger than the sum of its proper divisors (1).

131281169 is an equidigital number, since it uses as much as digits as its factorization.

131281169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 32.

The square root of 131281169 is about 11457.7994833214. The cubic root of 131281169 is about 508.2384038685.

The spelling of 131281169 in words is "one hundred thirty-one million, two hundred eighty-one thousand, one hundred sixty-nine".