188221541 has 2 divisors, whose sum is σ = 188221542. Its totient is φ = 188221540.

The previous prime is 188221531. The next prime is 188221567. The reversal of 188221541 is 145122881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185232100 + 2989441 = 13610^2 + 1729^2 .

It is a cyclic number.

It is not a de Polignac number, because 188221541 - 2¹⁸ = 187959397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 188221498 and 188221507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188221531) 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, 94110770 + 94110771.

It is an arithmetic number, because the mean of its divisors is an integer number (94110771).

Almost surely, 2^188221541 is an apocalyptic number.

It is an amenable number.

188221541 is a deficient number, since it is larger than the sum of its proper divisors (1).

188221541 is an equidigital number, since it uses as much as digits as its factorization.

188221541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5120, while the sum is 32.

The square root of 188221541 is about 13719.3855911990. The cubic root of 188221541 is about 573.0903666360.

The spelling of 188221541 in words is "one hundred eighty-eight million, two hundred twenty-one thousand, five hundred forty-one".