285085919 has 2 divisors, whose sum is σ = 285085920. Its totient is φ = 285085918.

The previous prime is 285085909. The next prime is 285085981. The reversal of 285085919 is 919580582.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285085919 is a prime.

It is a super-2 number, since 2×285085919² = 162547962424149122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285085909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142542959 + 142542960.

It is an arithmetic number, because the mean of its divisors is an integer number (142542960).

Almost surely, 2^285085919 is an apocalyptic number.

285085919 is a deficient number, since it is larger than the sum of its proper divisors (1).

285085919 is an equidigital number, since it uses as much as digits as its factorization.

285085919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 47.

The square root of 285085919 is about 16884.4875255366. The cubic root of 285085919 is about 658.1505608233.

The spelling of 285085919 in words is "two hundred eighty-five million, eighty-five thousand, nine hundred nineteen".