9001621 has 2 divisors, whose sum is σ = 9001622. Its totient is φ = 9001620.

The previous prime is 9001561. The next prime is 9001627. The reversal of 9001621 is 1261009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4778596 + 4223025 = 2186^2 + 2055^2 .

It is a cyclic number.

It is not a de Polignac number, because 9001621 - 2⁷ = 9001493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9001627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4500810 + 4500811.

It is an arithmetic number, because the mean of its divisors is an integer number (4500811).

Almost surely, 2^9001621 is an apocalyptic number.

It is an amenable number.

9001621 is a deficient number, since it is larger than the sum of its proper divisors (1).

9001621 is an equidigital number, since it uses as much as digits as its factorization.

9001621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 9001621 is about 3000.2701545028. The cubic root of 9001621 is about 208.0208697625.

The spelling of 9001621 in words is "nine million, one thousand, six hundred twenty-one".