128899313 has 4 divisors (see below), whose sum is σ = 128946420. Its totient is φ = 128852208.

The previous prime is 128899301. The next prime is 128899319. The reversal of 128899313 is 313998821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313998821 = 10247 ⋅30643.

It can be written as a sum of positive squares in 2 ways, for example, as 67699984 + 61199329 = 8228^2 + 7823^2 .

It is a cyclic number.

It is not a de Polignac number, because 128899313 - 2⁴ = 128899297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128899319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19178 + ... + 25011.

It is an arithmetic number, because the mean of its divisors is an integer number (32236605).

Almost surely, 2^128899313 is an apocalyptic number.

It is an amenable number.

128899313 is a deficient number, since it is larger than the sum of its proper divisors (47107).

128899313 is an equidigital number, since it uses as much as digits as its factorization.

128899313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47106.

The product of its digits is 93312, while the sum is 44.

The square root of 128899313 is about 11353.3833283299. The cubic root of 128899313 is about 505.1459408938.

The spelling of 128899313 in words is "one hundred twenty-eight million, eight hundred ninety-nine thousand, three hundred thirteen".