100299991 has 4 divisors (see below), whose sum is σ = 109418184. Its totient is φ = 91181800.

The previous prime is 100299961. The next prime is 100300001. The reversal of 100299991 is 199992001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100299991 - 2⁵ = 100299959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100299961) 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, 4559080 + ... + 4559101.

It is an arithmetic number, because the mean of its divisors is an integer number (27354546).

Almost surely, 2^100299991 is an apocalyptic number.

100299991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

100299991 is a deficient number, since it is larger than the sum of its proper divisors (9118193).

100299991 is an equidigital number, since it uses as much as digits as its factorization.

100299991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9118192.

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 100299991 is about 10014.9883175169. The cubic root of 100299991 is about 464.6225649608.

The spelling of 100299991 in words is "one hundred million, two hundred ninety-nine thousand, nine hundred ninety-one".