189221729 has 4 divisors (see below), whose sum is σ = 189278484. Its totient is φ = 189164976.

The previous prime is 189221717. The next prime is 189221749. The reversal of 189221729 is 927122981.

189221729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 927122981 = 7723 ⋅120047.

It can be written as a sum of positive squares in 2 ways, for example, as 73702225 + 115519504 = 8585^2 + 10748^2 .

It is a cyclic number.

It is not a de Polignac number, because 189221729 - 2¹⁶ = 189156193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189221749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23042 + ... + 30155.

It is an arithmetic number, because the mean of its divisors is an integer number (47319621).

Almost surely, 2^189221729 is an apocalyptic number.

It is an amenable number.

189221729 is a deficient number, since it is larger than the sum of its proper divisors (56755).

189221729 is an equidigital number, since it uses as much as digits as its factorization.

189221729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56754.

The product of its digits is 36288, while the sum is 41.

The square root of 189221729 is about 13755.7889268482. The cubic root of 189221729 is about 574.1036863443.

The spelling of 189221729 in words is "one hundred eighty-nine million, two hundred twenty-one thousand, seven hundred twenty-nine".