287851 has 2 divisors, whose sum is σ = 287852. Its totient is φ = 287850.

The previous prime is 287849. The next prime is 287857. The reversal of 287851 is 158782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 287851 - 2¹ = 287849 is a prime.

Together with 287849, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (287857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143925 + 143926.

It is an arithmetic number, because the mean of its divisors is an integer number (143926).

2²⁸⁷⁸⁵¹ is an apocalyptic number.

287851 is a deficient number, since it is larger than the sum of its proper divisors (1).

287851 is an equidigital number, since it uses as much as digits as its factorization.

287851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4480, while the sum is 31.

The square root of 287851 is about 536.5174740864. The cubic root of 287851 is about 66.0271544217.

The spelling of 287851 in words is "two hundred eighty-seven thousand, eight hundred fifty-one".