6387881 has 2 divisors, whose sum is σ = 6387882. Its totient is φ = 6387880.

The previous prime is 6387877. The next prime is 6387883. The reversal of 6387881 is 1887836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5953600 + 434281 = 2440^2 + 659^2 .

It is a cyclic number.

It is not a de Polignac number, because 6387881 - 2² = 6387877 is a prime.

It is a super-2 number, since 2×6387881² = 81610047340322, which contains 22 as substring.

Together with 6387883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6387883) 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, 3193940 + 3193941.

It is an arithmetic number, because the mean of its divisors is an integer number (3193941).

Almost surely, 2^6387881 is an apocalyptic number.

It is an amenable number.

6387881 is a deficient number, since it is larger than the sum of its proper divisors (1).

6387881 is an equidigital number, since it uses as much as digits as its factorization.

6387881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 41.

The square root of 6387881 is about 2527.4257654776. The cubic root of 6387881 is about 185.5462888482.

The spelling of 6387881 in words is "six million, three hundred eighty-seven thousand, eight hundred eighty-one".