287291 has 2 divisors, whose sum is σ = 287292. Its totient is φ = 287290.

The previous prime is 287281. The next prime is 287297. The reversal of 287291 is 192782.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 287291 - 2¹⁸ = 25147 is a prime.

It is a super-2 number, since 2×287291² = 165072237362, which contains 22 as substring.

It is a Chen prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 287291.

It is not a weakly prime, because it can be changed into another prime (287297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143645 + 143646.

It is an arithmetic number, because the mean of its divisors is an integer number (143646).

2²⁸⁷²⁹¹ is an apocalyptic number.

287291 is a deficient number, since it is larger than the sum of its proper divisors (1).

287291 is an equidigital number, since it uses as much as digits as its factorization.

287291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 29.

The square root of 287291 is about 535.9953358006. The cubic root of 287291 is about 65.9843090951.

The spelling of 287291 in words is "two hundred eighty-seven thousand, two hundred ninety-one".