100820171 has 4 divisors (see below), whose sum is σ = 100840272. Its totient is φ = 100800072.

The previous prime is 100820147. The next prime is 100820173. The reversal of 100820171 is 171028001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 171028001 = 9001 ⋅19001.

It is a cyclic number.

It is not a de Polignac number, because 100820171 - 2¹⁸ = 100558027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100820173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4385 + ... + 14861.

It is an arithmetic number, because the mean of its divisors is an integer number (25210068).

Almost surely, 2^100820171 is an apocalyptic number.

100820171 is a deficient number, since it is larger than the sum of its proper divisors (20101).

100820171 is an equidigital number, since it uses as much as digits as its factorization.

100820171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20100.

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

The square root of 100820171 is about 10040.9248080045. The cubic root of 100820171 is about 465.4243953723.

Adding to 100820171 its reverse (171028001), we get a palindrome (271848172).

The spelling of 100820171 in words is "one hundred million, eight hundred twenty thousand, one hundred seventy-one".