99991006 has 8 divisors (see below), whose sum is σ = 150035400. Its totient is φ = 49979208.

The previous prime is 99990973. The next prime is 99991009. The reversal of 99991006 is 60019999.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99991009) 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, 2100 + ... + 14296.

It is an arithmetic number, because the mean of its divisors is an integer number (18754425).

Almost surely, 2^99991006 is an apocalyptic number.

99991006 is a deficient number, since it is larger than the sum of its proper divisors (50044394).

99991006 is a wasteful number, since it uses less digits than its factorization.

99991006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16298.

The product of its (nonzero) digits is 39366, while the sum is 43.

The square root of 99991006 is about 9999.5502898880. The cubic root of 99991006 is about 464.1449674607.

The spelling of 99991006 in words is "ninety-nine million, nine hundred ninety-one thousand, six".