128512515 has 16 divisors (see below), whose sum is σ = 212253696. Its totient is φ = 66328800.

The previous prime is 128512511. The next prime is 128512541. The reversal of 128512515 is 515215821.

It is not a de Polignac number, because 128512515 - 2² = 128512511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128512511) 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 in 15 ways as a sum of consecutive naturals, for example, 137721 + ... + 138650.

It is an arithmetic number, because the mean of its divisors is an integer number (13265856).

Almost surely, 2^128512515 is an apocalyptic number.

128512515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128512515 is a deficient number, since it is larger than the sum of its proper divisors (83741181).

128512515 is a wasteful number, since it uses less digits than its factorization.

128512515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276410.

The product of its digits is 4000, while the sum is 30.

The square root of 128512515 is about 11336.3360483006. The cubic root of 128512515 is about 504.6401579909.

The spelling of 128512515 in words is "one hundred twenty-eight million, five hundred twelve thousand, five hundred fifteen".