2172188881 has 2 divisors, whose sum is σ = 2172188882. Its totient is φ = 2172188880.

The previous prime is 2172188861. The next prime is 2172188911. The reversal of 2172188881 is 1888812712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1486796481 + 685392400 = 38559^2 + 26180^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172188881 - 2¹⁷ = 2172057809 is a prime.

It is a super-2 number, since 2×2172188881² = 9436809069480064322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2172188831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086094440 + 1086094441.

It is an arithmetic number, because the mean of its divisors is an integer number (1086094441).

Almost surely, 2^2172188881 is an apocalyptic number.

It is an amenable number.

2172188881 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172188881 is an equidigital number, since it uses as much as digits as its factorization.

2172188881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 114688, while the sum is 46.

The square root of 2172188881 is about 46606.7471617576. The cubic root of 2172188881 is about 1295.0877498516.

The spelling of 2172188881 in words is "two billion, one hundred seventy-two million, one hundred eighty-eight thousand, eight hundred eighty-one".