287682116509 has 2 divisors, whose sum is σ = 287682116510. Its totient is φ = 287682116508.

The previous prime is 287682116489. The next prime is 287682116563. The reversal of 287682116509 is 905611286782.

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., 171590635225 + 116091481284 = 414235^2 + 340722^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-287682116509 is a prime.

It is a super-2 number, since 2×287682116509² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 287682116509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (287682116809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 143841058254 + 143841058255.

It is an arithmetic number, because the mean of its divisors is an integer number (143841058255).

Almost surely, 2^287682116509 is an apocalyptic number.

It is an amenable number.

287682116509 is a deficient number, since it is larger than the sum of its proper divisors (1).

287682116509 is an equidigital number, since it uses as much as digits as its factorization.

287682116509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 287682116509 in words is "two hundred eighty-seven billion, six hundred eighty-two million, one hundred sixteen thousand, five hundred nine".