287491 has 2 divisors, whose sum is σ = 287492. Its totient is φ = 287490.

The previous prime is 287449. The next prime is 287501. The reversal of 287491 is 194782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 287491 - 2¹⁷ = 156419 is a prime.

It is not a weakly prime, because it can be changed into another prime (287191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143745 + 143746.

It is an arithmetic number, because the mean of its divisors is an integer number (143746).

2²⁸⁷⁴⁹¹ is an apocalyptic number.

287491 is a deficient number, since it is larger than the sum of its proper divisors (1).

287491 is an equidigital number, since it uses as much as digits as its factorization.

287491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 31.

The square root of 287491 is about 536.1818721292. The cubic root of 287491 is about 65.9996173838. Note that the first 3 decimals are identical.

The spelling of 287491 in words is "two hundred eighty-seven thousand, four hundred ninety-one".