285948809 has 2 divisors, whose sum is σ = 285948810. Its totient is φ = 285948808.

The previous prime is 285948791. The next prime is 285948821. The reversal of 285948809 is 908849582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146047225 + 139901584 = 12085^2 + 11828^2 .

It is a cyclic number.

It is not a de Polignac number, because 285948809 - 2²⁴ = 269171593 is a prime.

It is not a weakly prime, because it can be changed into another prime (285948829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142974404 + 142974405.

It is an arithmetic number, because the mean of its divisors is an integer number (142974405).

Almost surely, 2^285948809 is an apocalyptic number.

It is an amenable number.

285948809 is a deficient number, since it is larger than the sum of its proper divisors (1).

285948809 is an equidigital number, since it uses as much as digits as its factorization.

285948809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1658880, while the sum is 53.

The square root of 285948809 is about 16910.0209639137. The cubic root of 285948809 is about 658.8139158350.

The spelling of 285948809 in words is "two hundred eighty-five million, nine hundred forty-eight thousand, eight hundred nine".