9109621 has 4 divisors (see below), whose sum is σ = 9115744. Its totient is φ = 9103500.

The previous prime is 9109619. The next prime is 9109627. The reversal of 9109621 is 1269019.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1269019 = 877 ⋅1447.

It is a cyclic number.

It is not a de Polignac number, because 9109621 - 2¹ = 9109619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9109621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9109627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 766 + ... + 4336.

It is an arithmetic number, because the mean of its divisors is an integer number (2278936).

Almost surely, 2^9109621 is an apocalyptic number.

It is an amenable number.

9109621 is a deficient number, since it is larger than the sum of its proper divisors (6123).

9109621 is a wasteful number, since it uses less digits than its factorization.

9109621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6122.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 9109621 is about 3018.2148697533. The cubic root of 9109621 is about 208.8494982668.

It can be divided in two parts, 9109 and 621, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 9109621 in words is "nine million, one hundred nine thousand, six hundred twenty-one".