166881241 has 2 divisors, whose sum is σ = 166881242. Its totient is φ = 166881240.

The previous prime is 166881229. The next prime is 166881251. The reversal of 166881241 is 142188661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116186841 + 50694400 = 10779^2 + 7120^2 .

It is a cyclic number.

It is not a de Polignac number, because 166881241 - 2¹⁷ = 166750169 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166881241.

It is not a weakly prime, because it can be changed into another prime (166881251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83440620 + 83440621.

It is an arithmetic number, because the mean of its divisors is an integer number (83440621).

Almost surely, 2^166881241 is an apocalyptic number.

It is an amenable number.

166881241 is a deficient number, since it is larger than the sum of its proper divisors (1).

166881241 is an equidigital number, since it uses as much as digits as its factorization.

166881241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 37.

The square root of 166881241 is about 12918.2522424669. The cubic root of 166881241 is about 550.5572764824.

The spelling of 166881241 in words is "one hundred sixty-six million, eight hundred eighty-one thousand, two hundred forty-one".