990105999 has 8 divisors (see below), whose sum is σ = 1320362112. Its totient is φ = 659960280.

The previous prime is 990105997. The next prime is 990106037. The reversal of 990105999 is 999501099.

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

It is not a de Polignac number, because 990105999 - 2¹ = 990105997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990105997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3717 + ... + 44654.

It is an arithmetic number, because the mean of its divisors is an integer number (165045264).

Almost surely, 2^990105999 is an apocalyptic number.

990105999 is a deficient number, since it is larger than the sum of its proper divisors (330256113).

990105999 is a wasteful number, since it uses less digits than its factorization.

990105999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55197.

The product of its (nonzero) digits is 295245, while the sum is 51.

The square root of 990105999 is about 31465.9498347023. The cubic root of 990105999 is about 996.6910626771.

The spelling of 990105999 in words is "nine hundred ninety million, one hundred five thousand, nine hundred ninety-nine".