189698221 has 2 divisors, whose sum is σ = 189698222. Its totient is φ = 189698220.

The previous prime is 189698219. The next prime is 189698237. The reversal of 189698221 is 122896981.

189698221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179265321 + 10432900 = 13389^2 + 3230^2 .

It is a cyclic number.

It is not a de Polignac number, because 189698221 - 2¹ = 189698219 is a prime.

Together with 189698219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189698281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94849110 + 94849111.

It is an arithmetic number, because the mean of its divisors is an integer number (94849111).

Almost surely, 2^189698221 is an apocalyptic number.

It is an amenable number.

189698221 is a deficient number, since it is larger than the sum of its proper divisors (1).

189698221 is an equidigital number, since it uses as much as digits as its factorization.

189698221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 46.

The square root of 189698221 is about 13773.0977270910. The cubic root of 189698221 is about 574.5851788171.

The spelling of 189698221 in words is "one hundred eighty-nine million, six hundred ninety-eight thousand, two hundred twenty-one".