987785717 has 2 divisors, whose sum is σ = 987785718. Its totient is φ = 987785716.

The previous prime is 987785713. The next prime is 987785779. The reversal of 987785717 is 717587789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 968080996 + 19704721 = 31114^2 + 4439^2 .

It is a cyclic number.

It is not a de Polignac number, because 987785717 - 2² = 987785713 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987785713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493892858 + 493892859.

It is an arithmetic number, because the mean of its divisors is an integer number (493892859).

Almost surely, 2^987785717 is an apocalyptic number.

It is an amenable number.

987785717 is a deficient number, since it is larger than the sum of its proper divisors (1).

987785717 is an equidigital number, since it uses as much as digits as its factorization.

987785717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6914880, while the sum is 59.

The square root of 987785717 is about 31429.0584809663. The cubic root of 987785717 is about 995.9118824023.

The spelling of 987785717 in words is "nine hundred eighty-seven million, seven hundred eighty-five thousand, seven hundred seventeen".