2180220181 has 2 divisors, whose sum is σ = 2180220182. Its totient is φ = 2180220180.

The previous prime is 2180220127. The next prime is 2180220247. The reversal of 2180220181 is 1810220812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1696616100 + 483604081 = 41190^2 + 21991^2 .

It is a cyclic number.

It is not a de Polignac number, because 2180220181 - 2²⁵ = 2146665749 is a prime.

It is a super-2 number, since 2×2180220181² = 9506720075279345522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2180220121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090110090 + 1090110091.

It is an arithmetic number, because the mean of its divisors is an integer number (1090110091).

Almost surely, 2^2180220181 is an apocalyptic number.

It is an amenable number.

2180220181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2180220181 is an equidigital number, since it uses as much as digits as its factorization.

2180220181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 2180220181 is about 46692.8279396312. The cubic root of 2180220181 is about 1296.6819091908.

Adding to 2180220181 its reverse (1810220812), we get a palindrome (3990440993).

The spelling of 2180220181 in words is "two billion, one hundred eighty million, two hundred twenty thousand, one hundred eighty-one".