99991002 has 8 divisors (see below), whose sum is σ = 199982016. Its totient is φ = 33330332.

The previous prime is 99990973. The next prime is 99991009. The reversal of 99991002 is 20019999.

It is a happy number.

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

99991002 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (99991009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8332578 + ... + 8332589.

It is an arithmetic number, because the mean of its divisors is an integer number (24997752).

Almost surely, 2^99991002 is an apocalyptic number.

99991002 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99991002 is a wasteful number, since it uses less digits than its factorization.

99991002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16665172.

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 99991002 is about 9999.5500898790. The cubic root of 99991002 is about 464.1449612716.

The spelling of 99991002 in words is "ninety-nine million, nine hundred ninety-one thousand, two".