285855971 has 2 divisors, whose sum is σ = 285855972. Its totient is φ = 285855970.

The previous prime is 285855919. The next prime is 285856001. The reversal of 285855971 is 179558582.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 285855971 - 2⁶ = 285855907 is a prime.

It is not a weakly prime, because it can be changed into another prime (285855571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142927985 + 142927986.

It is an arithmetic number, because the mean of its divisors is an integer number (142927986).

Almost surely, 2^285855971 is an apocalyptic number.

285855971 is a deficient number, since it is larger than the sum of its proper divisors (1).

285855971 is an equidigital number, since it uses as much as digits as its factorization.

285855971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008000, while the sum is 50.

The square root of 285855971 is about 16907.2756823801. The cubic root of 285855971 is about 658.7426098474.

The spelling of 285855971 in words is "two hundred eighty-five million, eight hundred fifty-five thousand, nine hundred seventy-one".