285997 has 2 divisors, whose sum is σ = 285998. Its totient is φ = 285996.

The previous prime is 285983. The next prime is 286001. The reversal of 285997 is 799582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 285156 + 841 = 534^2 + 29^2 .

It is a cyclic number.

It is not a de Polignac number, because 285997 - 2¹¹ = 283949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142998 + 142999.

It is an arithmetic number, because the mean of its divisors is an integer number (142999).

2²⁸⁵⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

285997 is a deficient number, since it is larger than the sum of its proper divisors (1).

285997 is an equidigital number, since it uses as much as digits as its factorization.

285997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 40.

The square root of 285997 is about 534.7868734365. The cubic root of 285997 is about 65.8850923762.

The spelling of 285997 in words is "two hundred eighty-five thousand, nine hundred ninety-seven".