660181 has 2 divisors, whose sum is σ = 660182. Its totient is φ = 660180.

The previous prime is 660167. The next prime is 660197. The reversal of 660181 is 181066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 576081 + 84100 = 759^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 660181 - 2⁷ = 660053 is a prime.

It is a super-2 number, since 2×660181² = 871677905522, which contains 22 as substring.

It is equal to p₅₃₅₈₁ and since 660181 and 53581 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330090 + 330091.

It is an arithmetic number, because the mean of its divisors is an integer number (330091).

2⁶⁶⁰¹⁸¹ is an apocalyptic number.

It is an amenable number.

660181 is a deficient number, since it is larger than the sum of its proper divisors (1).

660181 is an equidigital number, since it uses as much as digits as its factorization.

660181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 660181 is about 812.5152306265. The cubic root of 660181 is about 87.0738352367.

It can be divided in two parts, 660 and 181, that added together give a square (841 = 29²).

The spelling of 660181 in words is "six hundred sixty thousand, one hundred eighty-one".