15384781109 has 2 divisors, whose sum is σ = 15384781110. Its totient is φ = 15384781108.

The previous prime is 15384781103. The next prime is 15384781141. The reversal of 15384781109 is 90118748351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10936558084 + 4448223025 = 104578^2 + 66695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15384781109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15384781103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7692390554 + 7692390555.

It is an arithmetic number, because the mean of its divisors is an integer number (7692390555).

Almost surely, 2^15384781109 is an apocalyptic number.

It is an amenable number.

15384781109 is a deficient number, since it is larger than the sum of its proper divisors (1).

15384781109 is an equidigital number, since it uses as much as digits as its factorization.

15384781109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 15384781109 in words is "fifteen billion, three hundred eighty-four million, seven hundred eighty-one thousand, one hundred nine".