9990001 has 4 divisors (see below), whose sum is σ = 11417152. Its totient is φ = 8562852.

The previous prime is 9989957. The next prime is 9990017. The reversal of 9990001 is 1000999.

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.

It is a cyclic number.

It is not a de Polignac number, because 9990001 - 2¹¹ = 9987953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9994001) 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 3 ways as a sum of consecutive naturals, for example, 713565 + ... + 713578.

It is an arithmetic number, because the mean of its divisors is an integer number (2854288).

Almost surely, 2^9990001 is an apocalyptic number.

It is an amenable number.

9990001 is a deficient number, since it is larger than the sum of its proper divisors (1427151).

9990001 is a wasteful number, since it uses less digits than its factorization.

9990001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427150.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 9990001 is about 3160.6962840488. The cubic root of 9990001 is about 215.3716377483.

It can be divided in two parts, 99 and 90001, that added together give a triangular number (90100 = T₄₂₄).

The spelling of 9990001 in words is "nine million, nine hundred ninety thousand, one".