100991001 has 8 divisors (see below), whose sum is σ = 134839840. Its totient is φ = 67234752.

The previous prime is 100990979. The next prime is 100991041. The reversal of 100991001 is 100199001.

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

It is not a de Polignac number, because 100991001 - 2⁶ = 100990937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100991041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20560 + ... + 24993.

It is an arithmetic number, because the mean of its divisors is an integer number (16854980).

Almost surely, 2^100991001 is an apocalyptic number.

It is an amenable number.

100991001 is a deficient number, since it is larger than the sum of its proper divisors (33848839).

100991001 is an equidigital number, since it uses as much as digits as its factorization.

100991001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46295.

The product of its (nonzero) digits is 81, while the sum is 21.

The square root of 100991001 is about 10049.4278941639. The cubic root of 100991001 is about 465.6871192050.

The spelling of 100991001 in words is "one hundred million, nine hundred ninety-one thousand, one".