100209999 has 8 divisors (see below), whose sum is σ = 135304960. Its totient is φ = 65960856.

The previous prime is 100209997. The next prime is 100210001. The reversal of 100209999 is 999902001.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (100209997) and next prime (100210001).

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

It is not a de Polignac number, because 100209999 - 2¹ = 100209997 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 (100209997) 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, 211177 + ... + 211650.

It is an arithmetic number, because the mean of its divisors is an integer number (16913120).

Almost surely, 2^100209999 is an apocalyptic number.

100209999 is a deficient number, since it is larger than the sum of its proper divisors (35094961).

100209999 is an equidigital number, since it uses as much as digits as its factorization.

100209999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422909.

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 100209999 is about 10010.4944433330. The cubic root of 100209999 is about 464.4835658617.

The spelling of 100209999 in words is "one hundred million, two hundred nine thousand, nine hundred ninety-nine".