915128109 has 12 divisors (see below), whose sum is σ = 1510687776. Its totient is φ = 522930312.

The previous prime is 915128099. The next prime is 915128111. The reversal of 915128109 is 901821519.

It is not a de Polignac number, because 915128109 - 2⁷ = 915127981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (915128189) 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 11 ways as a sum of consecutive naturals, for example, 7262859 + ... + 7262984.

It is an arithmetic number, because the mean of its divisors is an integer number (125890648).

Almost surely, 2^915128109 is an apocalyptic number.

It is an amenable number.

915128109 is a deficient number, since it is larger than the sum of its proper divisors (595559667).

915128109 is a wasteful number, since it uses less digits than its factorization.

915128109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14525856 (or 14525853 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 915128109 is about 30251.0844268433. The cubic root of 915128109 is about 970.8689945276.

The spelling of 915128109 in words is "nine hundred fifteen million, one hundred twenty-eight thousand, one hundred nine".