285657899 has 2 divisors, whose sum is σ = 285657900. Its totient is φ = 285657898.

The previous prime is 285657821. The next prime is 285657923. The reversal of 285657899 is 998756582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 285657899 - 2²⁰ = 284609323 is a prime.

It is a super-2 number, since 2×285657899² = 163200870522188402, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (285657809) 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, 142828949 + 142828950.

It is an arithmetic number, because the mean of its divisors is an integer number (142828950).

Almost surely, 2^285657899 is an apocalyptic number.

285657899 is a deficient number, since it is larger than the sum of its proper divisors (1).

285657899 is an equidigital number, since it uses as much as digits as its factorization.

285657899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10886400, while the sum is 59.

The square root of 285657899 is about 16901.4170707666. The cubic root of 285657899 is about 658.5904252654.

The spelling of 285657899 in words is "two hundred eighty-five million, six hundred fifty-seven thousand, eight hundred ninety-nine".