287791873 has 2 divisors, whose sum is σ = 287791874. Its totient is φ = 287791872.

The previous prime is 287791859. The next prime is 287791877. The reversal of 287791873 is 378197782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 280328049 + 7463824 = 16743^2 + 2732^2 .

It is a cyclic number.

It is not a de Polignac number, because 287791873 - 2¹⁷ = 287660801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 287791873.

It is not a weakly prime, because it can be changed into another prime (287791877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143895936 + 143895937.

It is an arithmetic number, because the mean of its divisors is an integer number (143895937).

Almost surely, 2^287791873 is an apocalyptic number.

It is an amenable number.

287791873 is a deficient number, since it is larger than the sum of its proper divisors (1).

287791873 is an equidigital number, since it uses as much as digits as its factorization.

287791873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1185408, while the sum is 52.

The square root of 287791873 is about 16964.4296396902. The cubic root of 287791873 is about 660.2263326905.

The spelling of 287791873 in words is "two hundred eighty-seven million, seven hundred ninety-one thousand, eight hundred seventy-three".