188221871 has 2 divisors, whose sum is σ = 188221872. Its totient is φ = 188221870.

The previous prime is 188221837. The next prime is 188221889. The reversal of 188221871 is 178122881.

188221871 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188221871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188221171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94110935 + 94110936.

It is an arithmetic number, because the mean of its divisors is an integer number (94110936).

Almost surely, 2^188221871 is an apocalyptic number.

188221871 is a deficient number, since it is larger than the sum of its proper divisors (1).

188221871 is an equidigital number, since it uses as much as digits as its factorization.

188221871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14336, while the sum is 38.

The square root of 188221871 is about 13719.3976179714. The cubic root of 188221871 is about 573.0907015600.

The spelling of 188221871 in words is "one hundred eighty-eight million, two hundred twenty-one thousand, eight hundred seventy-one".