9521 has 2 divisors, whose sum is σ = 9522.
Its totient is φ = 9520.
The previous prime is 9511. The next prime is 9533. The reversal of 9521 is 1259.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 7921 + 1600 = 89^2 + 40^2
It is an emirp because it is prime and its reverse (1259) is a distict prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-9521 is a prime.
It is a Chen prime.
It is a plaindrome in base 13.
It is a nialpdrome in base 10.
It is a zygodrome in base 3.
It is a self number, because there is not a number n which added to its sum of digits gives 9521.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (9511) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4760 + 4761.
It is an arithmetic number, because the mean of its divisors is an integer number (4761).
29521 is an apocalyptic number.
It is an amenable number.
9521 is a deficient number, since it is larger than the sum of its proper divisors (1).
9521 is an equidigital number, since it uses as much as digits as its factorization.
9521 is an evil number, because the sum of its binary digits is even.
The product of its digits is 90, while the sum is 17.
The square root of 9521 is about 97.5756117070.
The cubic root of 9521 is about 21.1947121023.
The spelling of 9521 in words is "nine thousand, five hundred twenty-one".