15386981009 has 4 divisors (see below), whose sum is σ = 15391645620. Its totient is φ = 15382316400.

The previous prime is 15386980937. The next prime is 15386981059. The reversal of 15386981009 is 90018968351.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90018968351 = 13 ⋅6924536027.

It can be written as a sum of positive squares in 2 ways, for example, as 9888313600 + 5498667409 = 99440^2 + 74153^2 .

It is a cyclic number.

It is not a de Polignac number, because 15386981009 - 2¹⁶ = 15386915473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15386981059) 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, 2327354 + ... + 2333955.

It is an arithmetic number, because the mean of its divisors is an integer number (3847911405).

Almost surely, 2^15386981009 is an apocalyptic number.

It is an amenable number.

15386981009 is a deficient number, since it is larger than the sum of its proper divisors (4664611).

15386981009 is an equidigital number, since it uses as much as digits as its factorization.

15386981009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4664610.

The product of its (nonzero) digits is 466560, while the sum is 50.

The spelling of 15386981009 in words is "fifteen billion, three hundred eighty-six million, nine hundred eighty-one thousand, nine".