287117489 has 2 divisors, whose sum is σ = 287117490. Its totient is φ = 287117488.

The previous prime is 287117473. The next prime is 287117497. The reversal of 287117489 is 984711782.

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., 235162225 + 51955264 = 15335^2 + 7208^2 .

It is a cyclic number.

It is not a de Polignac number, because 287117489 - 2⁴ = 287117473 is a prime.

It is not a weakly prime, because it can be changed into another prime (287117449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143558744 + 143558745.

It is an arithmetic number, because the mean of its divisors is an integer number (143558745).

Almost surely, 2^287117489 is an apocalyptic number.

It is an amenable number.

287117489 is a deficient number, since it is larger than the sum of its proper divisors (1).

287117489 is an equidigital number, since it uses as much as digits as its factorization.

287117489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 225792, while the sum is 47.

The square root of 287117489 is about 16944.5415694848. The cubic root of 287117489 is about 659.7102255626.

The spelling of 287117489 in words is "two hundred eighty-seven million, one hundred seventeen thousand, four hundred eighty-nine".