9999001 has 4 divisors (see below), whose sum is σ = 10139904. Its totient is φ = 9858100.

The previous prime is 9998977. The next prime is 9999047. The reversal of 9999001 is 1009999.

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 an emirpimes, since its reverse is a distinct semiprime: 1009999 = 23 ⋅43913.

It is a cyclic number.

It is not a de Polignac number, because 9999001 - 2⁵ = 9998969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9999071) 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, 70345 + ... + 70486.

It is an arithmetic number, because the mean of its divisors is an integer number (2534976).

Almost surely, 2^9999001 is an apocalyptic number.

It is an amenable number.

9999001 is a deficient number, since it is larger than the sum of its proper divisors (140903).

9999001 is a wasteful number, since it uses less digits than its factorization.

9999001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140902.

The product of its (nonzero) digits is 6561, while the sum is 37.

The square root of 9999001 is about 3162.1197004541. The cubic root of 9999001 is about 215.4362944968.

It can be divided in two parts, 999 and 9001, that added together give a 4-th power (10000 = 10⁴).

The spelling of 9999001 in words is "nine million, nine hundred ninety-nine thousand, one".