1982549235509 has 4 divisors (see below), whose sum is σ = 1995176937804. Its totient is φ = 1969921533216.

The previous prime is 1982549235503. The next prime is 1982549235517. The reversal of 1982549235509 is 9055329452891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 245153716900 + 1737395518609 = 495130^2 + 1318103^2 .

It is a cyclic number.

It is not a de Polignac number, because 1982549235509 - 2⁴ = 1982549235493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982549235503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6313850912 + ... + 6313851225.

It is an arithmetic number, because the mean of its divisors is an integer number (498794234451).

Almost surely, 2^{1982549235509} is an apocalyptic number.

It is an amenable number.

1982549235509 is a deficient number, since it is larger than the sum of its proper divisors (12627702295).

1982549235509 is a wasteful number, since it uses less digits than its factorization.

1982549235509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12627702294.

The product of its (nonzero) digits is 34992000, while the sum is 62.

The spelling of 1982549235509 in words is "one trillion, nine hundred eighty-two billion, five hundred forty-nine million, two hundred thirty-five thousand, five hundred nine".