128512513 has 8 divisors (see below), whose sum is σ = 129595680. Its totient is φ = 127433760.

The previous prime is 128512511. The next prime is 128512541. The reversal of 128512513 is 315215821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128512513 - 2¹ = 128512511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128512511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81018 + ... + 82588.

It is an arithmetic number, because the mean of its divisors is an integer number (16199460).

Almost surely, 2^128512513 is an apocalyptic number.

It is an amenable number.

128512513 is a deficient number, since it is larger than the sum of its proper divisors (1083167).

128512513 is a wasteful number, since it uses less digits than its factorization.

128512513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207.

The product of its digits is 2400, while the sum is 28.

The square root of 128512513 is about 11336.3359600887. The cubic root of 128512513 is about 504.6401553731.

The spelling of 128512513 in words is "one hundred twenty-eight million, five hundred twelve thousand, five hundred thirteen".