285191 has 2 divisors, whose sum is σ = 285192. Its totient is φ = 285190.

The previous prime is 285179. The next prime is 285199. The reversal of 285191 is 191582.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285191 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 285191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142595 + 142596.

It is an arithmetic number, because the mean of its divisors is an integer number (142596).

2²⁸⁵¹⁹¹ is an apocalyptic number.

285191 is a deficient number, since it is larger than the sum of its proper divisors (1).

285191 is an equidigital number, since it uses as much as digits as its factorization.

285191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 26.

The square root of 285191 is about 534.0327705300. The cubic root of 285191 is about 65.8231414371.

The spelling of 285191 in words is "two hundred eighty-five thousand, one hundred ninety-one".