100018217 has 4 divisors (see below), whose sum is σ = 107711940. Its totient is φ = 92324496.

The previous prime is 100018213. The next prime is 100018231. The reversal of 100018217 is 712810001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712810001 = 31 ⋅22993871.

It can be written as a sum of positive squares in 2 ways, for example, as 58079641 + 41938576 = 7621^2 + 6476^2 .

It is a cyclic number.

It is not a de Polignac number, because 100018217 - 2² = 100018213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100018213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3846842 + ... + 3846867.

It is an arithmetic number, because the mean of its divisors is an integer number (26927985).

Almost surely, 2^100018217 is an apocalyptic number.

It is an amenable number.

100018217 is a deficient number, since it is larger than the sum of its proper divisors (7693723).

100018217 is an equidigital number, since it uses as much as digits as its factorization.

100018217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7693722.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 100018217 is about 10000.9108085214. The cubic root of 100018217 is about 464.1870669245.

Adding to 100018217 its reverse (712810001), we get a palindrome (812828218).

The spelling of 100018217 in words is "one hundred million, eighteen thousand, two hundred seventeen".