6667181 has 2 divisors, whose sum is σ = 6667182. Its totient is φ = 6667180.

The previous prime is 6667169. The next prime is 6667183. The reversal of 6667181 is 1817666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6295081 + 372100 = 2509^2 + 610^2 .

It is a cyclic number.

It is not a de Polignac number, because 6667181 - 2¹⁰ = 6666157 is a prime.

It is a super-2 number, since 2×6667181² = 88902604973522, which contains 22 as substring.

Together with 6667183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6667183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333590 + 3333591.

It is an arithmetic number, because the mean of its divisors is an integer number (3333591).

Almost surely, 2^6667181 is an apocalyptic number.

It is an amenable number.

6667181 is a deficient number, since it is larger than the sum of its proper divisors (1).

6667181 is an equidigital number, since it uses as much as digits as its factorization.

6667181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 6667181 is about 2582.0884957724. The cubic root of 6667181 is about 188.2120457137.

The spelling of 6667181 in words is "six million, six hundred sixty-seven thousand, one hundred eighty-one".