9821001 has 8 divisors (see below), whose sum is σ = 13137760. Its totient is φ = 6525792.

The previous prime is 9820997. The next prime is 9821033. The reversal of 9821001 is 1001289.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9821001 - 2² = 9820997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9821051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4291 + ... + 6168.

It is an arithmetic number, because the mean of its divisors is an integer number (1642220).

Almost surely, 2^9821001 is an apocalyptic number.

It is an amenable number.

9821001 is a deficient number, since it is larger than the sum of its proper divisors (3316759).

9821001 is a wasteful number, since it uses less digits than its factorization.

9821001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10775.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 9821001 is about 3133.8476350965. The cubic root of 9821001 is about 214.1502496832.

It can be divided in two parts, 982100 and 1, that added together give a triangular number (982101 = T₁₄₀₁).

The spelling of 9821001 in words is "nine million, eight hundred twenty-one thousand, one".