9621 has 6 divisors (see below), whose sum is σ = 13910. Its totient is φ = 6408.

The previous prime is 9619. The next prime is 9623. The reversal of 9621 is 1269.

9621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9619) and next prime (9623).

It can be written as a sum of positive squares in only one way, i.e., 8100 + 1521 = 90^2 + 39^2 .

It is not a de Polignac number, because 9621 - 2¹ = 9619 is a prime.

It is an Ulam number.

It is a Duffinian number.

9621 is a lucky number.

It is a plaindrome in base 12.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9594 and 9603.

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 9621.

It is not an unprimeable number, because it can be changed into a prime (9623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 526 + ... + 543.

2⁹⁶²¹ is an apocalyptic number.

It is an amenable number.

9621 is a deficient number, since it is larger than the sum of its proper divisors (4289).

9621 is a wasteful number, since it uses less digits than its factorization.

9621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075 (or 1072 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 9621 is about 98.0866963456. The cubic root of 9621 is about 21.2686572015.

It can be divided in two parts, 96 and 21, that multiplied together give a triangular number (2016 = T₆₃).

The spelling of 9621 in words is "nine thousand, six hundred twenty-one".