287287289 has 2 divisors, whose sum is σ = 287287290. Its totient is φ = 287287288.

The previous prime is 287287279. The next prime is 287287309. The reversal of 287287289 is 982782782.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221027689 + 66259600 = 14867^2 + 8140^2 .

It is a cyclic number.

It is not a de Polignac number, because 287287289 - 2²⁰ = 286238713 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 287287289.

It is not a weakly prime, because it can be changed into another prime (287287249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143643644 + 143643645.

It is an arithmetic number, because the mean of its divisors is an integer number (143643645).

Almost surely, 2^287287289 is an apocalyptic number.

It is an amenable number.

287287289 is a deficient number, since it is larger than the sum of its proper divisors (1).

287287289 is an equidigital number, since it uses as much as digits as its factorization.

287287289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1806336, while the sum is 53.

The square root of 287287289 is about 16949.5512919959. The cubic root of 287287289 is about 659.8402498272.

The spelling of 287287289 in words is "two hundred eighty-seven million, two hundred eighty-seven thousand, two hundred eighty-nine".