6381689 has 2 divisors, whose sum is σ = 6381690. Its totient is φ = 6381688.

The previous prime is 6381679. The next prime is 6381703. The reversal of 6381689 is 9861836.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4080400 + 2301289 = 2020^2 + 1517^2 .

It is a cyclic number.

It is not a de Polignac number, because 6381689 - 2¹⁶ = 6316153 is a prime.

It is not a weakly prime, because it can be changed into another prime (6381619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3190844 + 3190845.

It is an arithmetic number, because the mean of its divisors is an integer number (3190845).

Almost surely, 2^6381689 is an apocalyptic number.

It is an amenable number.

6381689 is a deficient number, since it is larger than the sum of its proper divisors (1).

6381689 is an equidigital number, since it uses as much as digits as its factorization.

6381689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 41.

The square root of 6381689 is about 2526.2005066898. The cubic root of 6381689 is about 185.4863172632.

The spelling of 6381689 in words is "six million, three hundred eighty-one thousand, six hundred eighty-nine".