285189899 has 2 divisors, whose sum is σ = 285189900. Its totient is φ = 285189898.

The previous prime is 285189869. The next prime is 285189907. The reversal of 285189899 is 998981582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 285189899 - 2¹⁶ = 285124363 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (285189869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142594949 + 142594950.

It is an arithmetic number, because the mean of its divisors is an integer number (142594950).

Almost surely, 2^285189899 is an apocalyptic number.

285189899 is a deficient number, since it is larger than the sum of its proper divisors (1).

285189899 is an equidigital number, since it uses as much as digits as its factorization.

285189899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3732480, while the sum is 59.

The square root of 285189899 is about 16887.5664025341. The cubic root of 285189899 is about 658.2305673200.

The spelling of 285189899 in words is "two hundred eighty-five million, one hundred eighty-nine thousand, eight hundred ninety-nine".