2381215509 has 32 divisors (see below), whose sum is σ = 3556425600. Its totient is φ = 1574622720.

The previous prime is 2381215481. The next prime is 2381215511. The reversal of 2381215509 is 9055121832.

2381215509 is a `hidden beast` number, since 2 + 3 + 81 + 21 + 550 + 9 = 666.

It is not a de Polignac number, because 2381215509 - 2¹³ = 2381207317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2381211509) 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 31 ways as a sum of consecutive naturals, for example, 2182054 + ... + 2183144.

It is an arithmetic number, because the mean of its divisors is an integer number (111138300).

Almost surely, 2^2381215509 is an apocalyptic number.

It is an amenable number.

2381215509 is a deficient number, since it is larger than the sum of its proper divisors (1175210091).

2381215509 is a wasteful number, since it uses less digits than its factorization.

2381215509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682 (or 1676 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 2381215509 is about 48797.6998330864. The cubic root of 2381215509 is about 1335.3637034549.

The spelling of 2381215509 in words is "two billion, three hundred eighty-one million, two hundred fifteen thousand, five hundred nine".