6551 has 2 divisors, whose sum is σ = 6552.
Its totient is φ = 6550.
The previous prime is 6547. The next prime is 6553. The reversal of 6551 is 1556.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 6551 - 22 = 6547 is a prime.
It is a Sophie Germain prime.
Together with 6553, it forms a pair of twin primes.
It is a Chen prime.
It is a plaindrome in base 14.
It is a nialpdrome in base 10.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 6551.
It is not a weakly prime, because it can be changed into another prime (6553) by changing a digit.
It is a good prime.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3275 + 3276.
It is an arithmetic number, because the mean of its divisors is an integer number (3276).
26551 is an apocalyptic number.
6551 is a deficient number, since it is larger than the sum of its proper divisors (1).
6551 is an equidigital number, since it uses as much as digits as its factorization.
6551 is an evil number, because the sum of its binary digits is even.
The product of its digits is 150, while the sum is 17.
The square root of 6551 is about 80.9382480660.
The cubic root of 6551 is about 18.7112384426.
It can be divided in two parts, 655 and 1, that added together give a palindrome (656).
The spelling of 6551 in words is "six thousand, five hundred fifty-one".