220101181 has 2 divisors, whose sum is σ = 220101182. Its totient is φ = 220101180.

The previous prime is 220101169. The next prime is 220101221. The reversal of 220101181 is 181101022.

220101181 = 10490² + 10491².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110061081 + 110040100 = 10491^2 + 10490^2 .

It is a cyclic number.

It is not a de Polignac number, because 220101181 - 2¹³ = 220092989 is a prime.

It is a super-2 number, since 2×220101181² = 96889059755189522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220101121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110050590 + 110050591.

It is an arithmetic number, because the mean of its divisors is an integer number (110050591).

Almost surely, 2^220101181 is an apocalyptic number.

220101181 is the 10491-st centered square number.

It is an amenable number.

220101181 is a deficient number, since it is larger than the sum of its proper divisors (1).

220101181 is an equidigital number, since it uses as much as digits as its factorization.

220101181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 220101181 is about 14835.8073929261. The cubic root of 220101181 is about 603.7736065481.

The spelling of 220101181 in words is "two hundred twenty million, one hundred one thousand, one hundred eighty-one".