11621 has 2 divisors, whose sum is σ = 11622.
Its totient is φ = 11620.
The previous prime is 11617. The next prime is 11633. The reversal of 11621 is 12611.
Subtracting 11621 from its reverse (12611), we obtain a triangular number (990 = T44).
It is a m-pointer prime, because the next prime (11633) can be obtained adding 11621 to its product of digits (12).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 7396 + 4225 = 86^2 + 65^2
It is an emirp because it is prime and its reverse (12611) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 11621 - 22 = 11617 is a prime.
It is a Chen prime.
It is a plaindrome in base 15.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (11681) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5810 + 5811.
It is an arithmetic number, because the mean of its divisors is an integer number (5811).
211621 is an apocalyptic number.
It is an amenable number.
11621 is a deficient number, since it is larger than the sum of its proper divisors (1).
11621 is an equidigital number, since it uses as much as digits as its factorization.
11621 is an evil number, because the sum of its binary digits is even.
The product of its digits is 12, while the sum is 11.
The square root of 11621 is about 107.8007421125.
The cubic root of 11621 is about 22.6506759573.
The spelling of 11621 in words is "eleven thousand, six hundred twenty-one".