188221829 has 2 divisors, whose sum is σ = 188221830. Its totient is φ = 188221828.

The previous prime is 188221769. The next prime is 188221837. The reversal of 188221829 is 928122881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153388225 + 34833604 = 12385^2 + 5902^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188221829 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 (188221889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94110914 + 94110915.

It is an arithmetic number, because the mean of its divisors is an integer number (94110915).

Almost surely, 2^188221829 is an apocalyptic number.

It is an amenable number.

188221829 is a deficient number, since it is larger than the sum of its proper divisors (1).

188221829 is an equidigital number, since it uses as much as digits as its factorization.

188221829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 41.

The square root of 188221829 is about 13719.3960872919. The cubic root of 188221829 is about 573.0906589333.

The spelling of 188221829 in words is "one hundred eighty-eight million, two hundred twenty-one thousand, eight hundred twenty-nine".