6381861 has 4 divisors (see below), whose sum is σ = 8509152. Its totient is φ = 4254572.

The previous prime is 6381847. The next prime is 6381863. The reversal of 6381861 is 1681836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6381861 - 2⁵ = 6381829 is a prime.

It is an Ulam number.

It is a D-number.

6381861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6381863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063641 + ... + 1063646.

It is an arithmetic number, because the mean of its divisors is an integer number (2127288).

Almost surely, 2^6381861 is an apocalyptic number.

It is an amenable number.

6381861 is a deficient number, since it is larger than the sum of its proper divisors (2127291).

6381861 is a wasteful number, since it uses less digits than its factorization.

6381861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127290.

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

The square root of 6381861 is about 2526.2345496806. The cubic root of 6381861 is about 185.4879836642.

The spelling of 6381861 in words is "six million, three hundred eighty-one thousand, eight hundred sixty-one".