100218161 has 2 divisors, whose sum is σ = 100218162. Its totient is φ = 100218160.

The previous prime is 100218149. The next prime is 100218187. The reversal of 100218161 is 161812001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61230625 + 38987536 = 7825^2 + 6244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100218161 is a prime.

It is not a weakly prime, because it can be changed into another prime (100215161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50109080 + 50109081.

It is an arithmetic number, because the mean of its divisors is an integer number (50109081).

Almost surely, 2^100218161 is an apocalyptic number.

It is an amenable number.

100218161 is a deficient number, since it is larger than the sum of its proper divisors (1).

100218161 is an equidigital number, since it uses as much as digits as its factorization.

100218161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 100218161 is about 10010.9021072029. The cubic root of 100218161 is about 464.4961760868.

The spelling of 100218161 in words is "one hundred million, two hundred eighteen thousand, one hundred sixty-one".