4081985509 has 24 divisors (see below), whose sum is σ = 4868922240. Its totient is φ = 3348289056.

The previous prime is 4081985507. The next prime is 4081985527. The reversal of 4081985509 is 9055891804.

It is not a de Polignac number, because 4081985509 - 2¹ = 4081985507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4081985507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11763474 + ... + 11763820.

It is an arithmetic number, because the mean of its divisors is an integer number (202871760).

Almost surely, 2^4081985509 is an apocalyptic number.

It is an amenable number.

4081985509 is a deficient number, since it is larger than the sum of its proper divisors (786936731).

4081985509 is an equidigital number, since it uses as much as digits as its factorization.

4081985509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 49.

The square root of 4081985509 is about 63890.4179748419. The cubic root of 4081985509 is about 1598.1731113269.

The spelling of 4081985509 in words is "four billion, eighty-one million, nine hundred eighty-five thousand, five hundred nine".