987718493 has 2 divisors, whose sum is σ = 987718494. Its totient is φ = 987718492.

The previous prime is 987718483. The next prime is 987718499. The reversal of 987718493 is 394817789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 500103769 + 487614724 = 22363^2 + 22082^2 .

It is a cyclic number.

It is not a de Polignac number, because 987718493 - 2¹⁰ = 987717469 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987718499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493859246 + 493859247.

It is an arithmetic number, because the mean of its divisors is an integer number (493859247).

Almost surely, 2^987718493 is an apocalyptic number.

It is an amenable number.

987718493 is a deficient number, since it is larger than the sum of its proper divisors (1).

987718493 is an equidigital number, since it uses as much as digits as its factorization.

987718493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 56.

The square root of 987718493 is about 31427.9890066164. The cubic root of 987718493 is about 995.8892895471.

The spelling of 987718493 in words is "nine hundred eighty-seven million, seven hundred eighteen thousand, four hundred ninety-three".