100208181 has 4 divisors (see below), whose sum is σ = 133610912. Its totient is φ = 66805452.

The previous prime is 100208161. The next prime is 100208197. The reversal of 100208181 is 181802001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 181802001 = 3 ⋅60600667.

It is not a de Polignac number, because 100208181 - 2⁶ = 100208117 is a prime.

It is a super-2 number, since 2×100208181² = 20083359078657522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100208111) 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, 16701361 + ... + 16701366.

It is an arithmetic number, because the mean of its divisors is an integer number (33402728).

Almost surely, 2^100208181 is an apocalyptic number.

It is an amenable number.

100208181 is a deficient number, since it is larger than the sum of its proper divisors (33402731).

100208181 is an equidigital number, since it uses as much as digits as its factorization.

100208181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33402730.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 100208181 is about 10010.4036382156. The cubic root of 100208181 is about 464.4807569729.

The spelling of 100208181 in words is "one hundred million, two hundred eight thousand, one hundred eighty-one".