984781493509 has 18 divisors (see below), whose sum is σ = 1092502901490. Its totient is φ = 886939891200.

The previous prime is 984781493503. The next prime is 984781493519. The reversal of 984781493509 is 905394187489.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 15043022500 + 969738471009 = 122650^2 + 984753^2 .

It is not a de Polignac number, because 984781493509 - 2²⁹ = 984244622597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (984781493503) 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 in 17 ways as a sum of consecutive naturals, for example, 113961829 + ... + 113970469.

Almost surely, 2^984781493509 is an apocalyptic number.

It is an amenable number.

984781493509 is a deficient number, since it is larger than the sum of its proper divisors (107721407981).

984781493509 is an frugal number, since it uses more digits than its factorization.

984781493509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17413 (or 8761 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 67.

The spelling of 984781493509 in words is "nine hundred eighty-four billion, seven hundred eighty-one million, four hundred ninety-three thousand, five hundred nine".