189543553 has 2 divisors, whose sum is σ = 189543554. Its totient is φ = 189543552.

The previous prime is 189543539. The next prime is 189543559. The reversal of 189543553 is 355345981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128890609 + 60652944 = 11353^2 + 7788^2 .

It is a cyclic number.

It is not a de Polignac number, because 189543553 - 2¹⁷ = 189412481 is a prime.

It is not a weakly prime, because it can be changed into another prime (189543559) 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, 94771776 + 94771777.

It is an arithmetic number, because the mean of its divisors is an integer number (94771777).

Almost surely, 2^189543553 is an apocalyptic number.

It is an amenable number.

189543553 is a deficient number, since it is larger than the sum of its proper divisors (1).

189543553 is an equidigital number, since it uses as much as digits as its factorization.

189543553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324000, while the sum is 43.

The square root of 189543553 is about 13767.4817232492. The cubic root of 189543553 is about 574.4289761497.

It can be divided in two parts, 189543 and 553, that added together give a square (190096 = 436²).

The spelling of 189543553 in words is "one hundred eighty-nine million, five hundred forty-three thousand, five hundred fifty-three".