285239189 has 2 divisors, whose sum is σ = 285239190. Its totient is φ = 285239188.

The previous prime is 285239147. The next prime is 285239197. The reversal of 285239189 is 981932582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 273902500 + 11336689 = 16550^2 + 3367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285239189 is a prime.

It is a super-2 number, since 2×285239189² = 162722789882755442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285239089) 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, 142619594 + 142619595.

It is an arithmetic number, because the mean of its divisors is an integer number (142619595).

Almost surely, 2^285239189 is an apocalyptic number.

It is an amenable number.

285239189 is a deficient number, since it is larger than the sum of its proper divisors (1).

285239189 is an equidigital number, since it uses as much as digits as its factorization.

285239189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 47.

The square root of 285239189 is about 16889.0256971798. The cubic root of 285239189 is about 658.2684862830.

The spelling of 285239189 in words is "two hundred eighty-five million, two hundred thirty-nine thousand, one hundred eighty-nine".