128976513 has 4 divisors (see below), whose sum is σ = 171968688. Its totient is φ = 85984340.

The previous prime is 128976511. The next prime is 128976553. The reversal of 128976513 is 315679821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128976513 - 2¹ = 128976511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128976511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21496083 + ... + 21496088.

It is an arithmetic number, because the mean of its divisors is an integer number (42992172).

Almost surely, 2^128976513 is an apocalyptic number.

It is an amenable number.

128976513 is a deficient number, since it is larger than the sum of its proper divisors (42992175).

128976513 is an equidigital number, since it uses as much as digits as its factorization.

128976513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42992174.

The product of its digits is 90720, while the sum is 42.

The square root of 128976513 is about 11356.7826870113. The cubic root of 128976513 is about 505.2467676113.

The spelling of 128976513 in words is "one hundred twenty-eight million, nine hundred seventy-six thousand, five hundred thirteen".