15128491789 has 2 divisors, whose sum is σ = 15128491790. Its totient is φ = 15128491788.

The previous prime is 15128491787. The next prime is 15128491871. The reversal of 15128491789 is 98719482151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11855507689 + 3272984100 = 108883^2 + 57210^2 .

It is a cyclic number.

It is not a de Polignac number, because 15128491789 - 2¹ = 15128491787 is a prime.

Together with 15128491787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15128491787) 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 as a sum of consecutive naturals, namely, 7564245894 + 7564245895.

It is an arithmetic number, because the mean of its divisors is an integer number (7564245895).

Almost surely, 2^15128491789 is an apocalyptic number.

It is an amenable number.

15128491789 is a deficient number, since it is larger than the sum of its proper divisors (1).

15128491789 is an equidigital number, since it uses as much as digits as its factorization.

15128491789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 55.

The spelling of 15128491789 in words is "fifteen billion, one hundred twenty-eight million, four hundred ninety-one thousand, seven hundred eighty-nine".