100420181 has 2 divisors, whose sum is σ = 100420182. Its totient is φ = 100420180.

The previous prime is 100420171. The next prime is 100420217. The reversal of 100420181 is 181024001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100180081 + 240100 = 10009^2 + 490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100420181 is a prime.

It is a super-2 number, since 2×100420181² = 20168425504145522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100420141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50210090 + 50210091.

It is an arithmetic number, because the mean of its divisors is an integer number (50210091).

Almost surely, 2^100420181 is an apocalyptic number.

It is an amenable number.

100420181 is a deficient number, since it is larger than the sum of its proper divisors (1).

100420181 is an equidigital number, since it uses as much as digits as its factorization.

100420181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 100420181 is about 10020.9870272344. The cubic root of 100420181 is about 464.8080774244.

Adding to 100420181 its reverse (181024001), we get a palindrome (281444182).

The spelling of 100420181 in words is "one hundred million, four hundred twenty thousand, one hundred eighty-one".