11551 has 2 divisors, whose sum is σ = 11552.
Its totient is φ = 11550.
The previous prime is 11549. The next prime is 11579. The reversal of 11551 is 15511.
It can be divided in two parts, 1155 and 1, that added together give a square (1156 = 342).
It is a weak prime.
It is an emirp because it is prime and its reverse (15511) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 11551 - 21 = 11549 is a prime.
Together with 11549, it forms a pair of twin primes.
It is a Chen prime.
It is a nialpdrome in base 11.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (11251) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5775 + 5776.
It is an arithmetic number, because the mean of its divisors is an integer number (5776).
211551 is an apocalyptic number.
11551 is a deficient number, since it is larger than the sum of its proper divisors (1).
11551 is an equidigital number, since it uses as much as digits as its factorization.
11551 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 25, while the sum is 13.
The square root of 11551 is about 107.4755786214.
The cubic root of 11551 is about 22.6051049632.
The spelling of 11551 in words is "eleven thousand, five hundred fifty-one".