188871281 has 2 divisors, whose sum is σ = 188871282. Its totient is φ = 188871280.

The previous prime is 188871271. The next prime is 188871283. The reversal of 188871281 is 182178881.

188871281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139027681 + 49843600 = 11791^2 + 7060^2 .

It is a cyclic number.

It is not a de Polignac number, because 188871281 - 2⁶ = 188871217 is a prime.

It is a super-2 number, since 2×188871281² = 71344721573161922, which contains 22 as substring.

Together with 188871283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (188871283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94435640 + 94435641.

It is an arithmetic number, because the mean of its divisors is an integer number (94435641).

Almost surely, 2^188871281 is an apocalyptic number.

It is an amenable number.

188871281 is a deficient number, since it is larger than the sum of its proper divisors (1).

188871281 is an equidigital number, since it uses as much as digits as its factorization.

188871281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57344, while the sum is 44.

The square root of 188871281 is about 13743.0448227458. The cubic root of 188871281 is about 573.7490445096.

The spelling of 188871281 in words is "one hundred eighty-eight million, eight hundred seventy-one thousand, two hundred eighty-one".