6381681 has 8 divisors (see below), whose sum is σ = 9009504. Its totient is φ = 4004160.

The previous prime is 6381679. The next prime is 6381689. The reversal of 6381681 is 1861836.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6381681 - 2¹ = 6381679 is a prime.

It is a super-2 number, since 2×6381681² = 81451704771522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6381689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62515 + ... + 62616.

It is an arithmetic number, because the mean of its divisors is an integer number (1126188).

Almost surely, 2^6381681 is an apocalyptic number.

It is an amenable number.

6381681 is a deficient number, since it is larger than the sum of its proper divisors (2627823).

6381681 is a wasteful number, since it uses less digits than its factorization.

6381681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125151.

The product of its digits is 6912, while the sum is 33.

The square root of 6381681 is about 2526.1989232838. The cubic root of 6381681 is about 185.4862397554.

The spelling of 6381681 in words is "six million, three hundred eighty-one thousand, six hundred eighty-one".