100328991 has 16 divisors (see below), whose sum is σ = 153182208. Its totient is φ = 57218400.

The previous prime is 100328983. The next prime is 100328993. The reversal of 100328991 is 199823001.

It is not a de Polignac number, because 100328991 - 2³ = 100328983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100328993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6946 + ... + 15776.

It is an arithmetic number, because the mean of its divisors is an integer number (9573888).

Almost surely, 2^100328991 is an apocalyptic number.

100328991 is a deficient number, since it is larger than the sum of its proper divisors (52853217).

100328991 is an equidigital number, since it uses as much as digits as its factorization.

100328991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9382.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 100328991 is about 10016.4360428248. The cubic root of 100328991 is about 464.6673398269.

The spelling of 100328991 in words is "one hundred million, three hundred twenty-eight thousand, nine hundred ninety-one".