128259013 has 4 divisors (see below), whose sum is σ = 128324620. Its totient is φ = 128193408.

The previous prime is 128259011. The next prime is 128259023. The reversal of 128259013 is 310952821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114554209 + 13704804 = 10703^2 + 3702^2 .

It is a cyclic number.

It is not a de Polignac number, because 128259013 - 2¹ = 128259011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128259011) 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, 29778 + ... + 33811.

It is an arithmetic number, because the mean of its divisors is an integer number (32081155).

Almost surely, 2^128259013 is an apocalyptic number.

It is an amenable number.

128259013 is a deficient number, since it is larger than the sum of its proper divisors (65607).

128259013 is an equidigital number, since it uses as much as digits as its factorization.

128259013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65606.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 128259013 is about 11325.1495795861. The cubic root of 128259013 is about 504.3081241873.

The spelling of 128259013 in words is "one hundred twenty-eight million, two hundred fifty-nine thousand, thirteen".