128284913 has 4 divisors (see below), whose sum is σ = 132423168. Its totient is φ = 124146660.

The previous prime is 128284909. The next prime is 128284931. The reversal of 128284913 is 319482821.

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 128284913 - 2² = 128284909 is a prime.

It is a super-3 number, since 3×128284913³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128284943) 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, 2069081 + ... + 2069142.

It is an arithmetic number, because the mean of its divisors is an integer number (33105792).

Almost surely, 2^128284913 is an apocalyptic number.

It is an amenable number.

128284913 is a deficient number, since it is larger than the sum of its proper divisors (4138255).

128284913 is an equidigital number, since it uses as much as digits as its factorization.

128284913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4138254.

The product of its digits is 27648, while the sum is 38.

The square root of 128284913 is about 11326.2929946210. The cubic root of 128284913 is about 504.3420677442.

The spelling of 128284913 in words is "one hundred twenty-eight million, two hundred eighty-four thousand, nine hundred thirteen".