189056521 has 2 divisors, whose sum is σ = 189056522. Its totient is φ = 189056520.

The previous prime is 189056503. The next prime is 189056531. The reversal of 189056521 is 125650981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186622921 + 2433600 = 13661^2 + 1560^2 .

It is an emirp because it is prime and its reverse (125650981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189056521 - 2⁵ = 189056489 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (189056531) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94528260 + 94528261.

It is an arithmetic number, because the mean of its divisors is an integer number (94528261).

Almost surely, 2^189056521 is an apocalyptic number.

It is an amenable number.

189056521 is a deficient number, since it is larger than the sum of its proper divisors (1).

189056521 is an equidigital number, since it uses as much as digits as its factorization.

189056521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 189056521 is about 13749.7825800992. The cubic root of 189056521 is about 573.9365558937.

The spelling of 189056521 in words is "one hundred eighty-nine million, fifty-six thousand, five hundred twenty-one".