189628221089 has 2 divisors, whose sum is σ = 189628221090. Its totient is φ = 189628221088.

The previous prime is 189628221037. The next prime is 189628221137. The reversal of 189628221089 is 980122826981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173655558400 + 15972662689 = 416720^2 + 126383^2 .

It is a cyclic number.

It is not a de Polignac number, because 189628221089 - 2³⁶ = 120908744353 is a prime.

It is not a weakly prime, because it can be changed into another prime (189628221689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94814110544 + 94814110545.

It is an arithmetic number, because the mean of its divisors is an integer number (94814110545).

Almost surely, 2^189628221089 is an apocalyptic number.

It is an amenable number.

189628221089 is a deficient number, since it is larger than the sum of its proper divisors (1).

189628221089 is an equidigital number, since it uses as much as digits as its factorization.

189628221089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1990656, while the sum is 56.

The spelling of 189628221089 in words is "one hundred eighty-nine billion, six hundred twenty-eight million, two hundred twenty-one thousand, eighty-nine".