99999001 has 4 divisors (see below), whose sum is σ = 100164352. Its totient is φ = 99833652.

The previous prime is 99998999. The next prime is 99999043. The reversal of 99999001 is 10099999.

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 99999001 - 2¹ = 99998999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99999401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81765 + ... + 82978.

It is an arithmetic number, because the mean of its divisors is an integer number (25041088).

Almost surely, 2^99999001 is an apocalyptic number.

It is an amenable number.

99999001 is a deficient number, since it is larger than the sum of its proper divisors (165351).

99999001 is a wasteful number, since it uses less digits than its factorization.

99999001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165350.

The product of its (nonzero) digits is 59049, while the sum is 46.

The square root of 99999001 is about 9999.9500498752. The cubic root of 99999001 is about 464.1573377070.

It can be divided in two parts, 999 and 99001, that added together give a 5-th power (100000 = 10⁵).

The spelling of 99999001 in words is "ninety-nine million, nine hundred ninety-nine thousand, one".