188837221 has 2 divisors, whose sum is σ = 188837222. Its totient is φ = 188837220.

The previous prime is 188837197. The next prime is 188837227. The reversal of 188837221 is 122738881.

188837221 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., 120692196 + 68145025 = 10986^2 + 8255^2 .

It is a cyclic number.

It is not a de Polignac number, because 188837221 - 2¹⁵ = 188804453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188837227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94418610 + 94418611.

It is an arithmetic number, because the mean of its divisors is an integer number (94418611).

Almost surely, 2^188837221 is an apocalyptic number.

It is an amenable number.

188837221 is a deficient number, since it is larger than the sum of its proper divisors (1).

188837221 is an equidigital number, since it uses as much as digits as its factorization.

188837221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 40.

The square root of 188837221 is about 13741.8055946080. The cubic root of 188837221 is about 573.7145535287.

The spelling of 188837221 in words is "one hundred eighty-eight million, eight hundred thirty-seven thousand, two hundred twenty-one".