287681249 has 2 divisors, whose sum is σ = 287681250. Its totient is φ = 287681248.

The previous prime is 287681221. The next prime is 287681269. The reversal of 287681249 is 942186782.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198246400 + 89434849 = 14080^2 + 9457^2 .

It is a cyclic number.

It is not a de Polignac number, because 287681249 - 2¹² = 287677153 is a prime.

It is not a weakly prime, because it can be changed into another prime (287681269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143840624 + 143840625.

It is an arithmetic number, because the mean of its divisors is an integer number (143840625).

Almost surely, 2^287681249 is an apocalyptic number.

It is an amenable number.

287681249 is a deficient number, since it is larger than the sum of its proper divisors (1).

287681249 is an equidigital number, since it uses as much as digits as its factorization.

287681249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 47.

The square root of 287681249 is about 16961.1688571277. The cubic root of 287681249 is about 660.1417272923.

The spelling of 287681249 in words is "two hundred eighty-seven million, six hundred eighty-one thousand, two hundred forty-nine".