189285281 has 2 divisors, whose sum is σ = 189285282. Its totient is φ = 189285280.

The previous prime is 189285241. The next prime is 189285311. The reversal of 189285281 is 182582981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185204881 + 4080400 = 13609^2 + 2020^2 .

It is a cyclic number.

It is not a de Polignac number, because 189285281 - 2¹⁴ = 189268897 is a prime.

It is a super-2 number, since 2×189285281² = 71657835206497922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (189285241) 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, 94642640 + 94642641.

It is an arithmetic number, because the mean of its divisors is an integer number (94642641).

Almost surely, 2^189285281 is an apocalyptic number.

It is an amenable number.

189285281 is a deficient number, since it is larger than the sum of its proper divisors (1).

189285281 is an equidigital number, since it uses as much as digits as its factorization.

189285281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92160, while the sum is 44.

The square root of 189285281 is about 13758.0987421954. The cubic root of 189285281 is about 574.1679519614.

The spelling of 189285281 in words is "one hundred eighty-nine million, two hundred eighty-five thousand, two hundred eighty-one".