6671381 has 2 divisors, whose sum is σ = 6671382. Its totient is φ = 6671380.

The previous prime is 6671377. The next prime is 6671383. The reversal of 6671381 is 1831766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6584356 + 87025 = 2566^2 + 295^2 .

It is a cyclic number.

It is not a de Polignac number, because 6671381 - 2² = 6671377 is a prime.

It is a super-2 number, since 2×6671381² = 89014648894322, which contains 22 as substring.

Together with 6671383, 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 (6671383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3335690 + 3335691.

It is an arithmetic number, because the mean of its divisors is an integer number (3335691).

Almost surely, 2^6671381 is an apocalyptic number.

It is an amenable number.

6671381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6671381 is an equidigital number, since it uses as much as digits as its factorization.

6671381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 6671381 is about 2582.9016628590. The cubic root of 6671381 is about 188.2515588983.

It can be divided in two parts, 667 and 1381, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 6671381 in words is "six million, six hundred seventy-one thousand, three hundred eighty-one".