131166281 has 4 divisors (see below), whose sum is σ = 131194500. Its totient is φ = 131138064.

The previous prime is 131166241. The next prime is 131166293. The reversal of 131166281 is 182661131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 182661131 = 191 ⋅956341.

It can be written as a sum of positive squares in 2 ways, for example, as 16483600 + 114682681 = 4060^2 + 10709^2 .

It is a cyclic number.

It is not a de Polignac number, because 131166281 - 2¹⁴ = 131149897 is a prime.

It is a super-2 number, since 2×131166281² = 34409186542741922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131166241) 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 in 3 ways as a sum of consecutive naturals, for example, 5306 + ... + 17043.

It is an arithmetic number, because the mean of its divisors is an integer number (32798625).

Almost surely, 2^131166281 is an apocalyptic number.

It is an amenable number.

131166281 is a deficient number, since it is larger than the sum of its proper divisors (28219).

131166281 is an equidigital number, since it uses as much as digits as its factorization.

131166281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28218.

The product of its digits is 1728, while the sum is 29.

The square root of 131166281 is about 11452.7848578413. The cubic root of 131166281 is about 508.0901024897.

The spelling of 131166281 in words is "one hundred thirty-one million, one hundred sixty-six thousand, two hundred eighty-one".