2180726189 has 2 divisors, whose sum is σ = 2180726190. Its totient is φ = 2180726188.

The previous prime is 2180726183. The next prime is 2180726201. The reversal of 2180726189 is 9816270812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1115226025 + 1065500164 = 33395^2 + 32642^2 .

It is a cyclic number.

It is not a de Polignac number, because 2180726189 - 2⁴ = 2180726173 is a prime.

It is a super-2 number, since 2×2180726189² = 9511133422780927442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2180726183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090363094 + 1090363095.

It is an arithmetic number, because the mean of its divisors is an integer number (1090363095).

Almost surely, 2^2180726189 is an apocalyptic number.

It is an amenable number.

2180726189 is a deficient number, since it is larger than the sum of its proper divisors (1).

2180726189 is an equidigital number, since it uses as much as digits as its factorization.

2180726189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 2180726189 is about 46698.2461019683. The cubic root of 2180726189 is about 1296.7822172042.

The spelling of 2180726189 in words is "two billion, one hundred eighty million, seven hundred twenty-six thousand, one hundred eighty-nine".