128253331 has 4 divisors (see below), whose sum is σ = 128319552. Its totient is φ = 128187112.

The previous prime is 128253329. The next prime is 128253379. The reversal of 128253331 is 133352821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133352821 = 7 ⋅19050403.

It is a cyclic number.

It is not a de Polignac number, because 128253331 - 2¹ = 128253329 is a prime.

It is a super-2 number, since 2×128253331² = 32897833825191122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128253331.

It is not an unprimeable number, because it can be changed into a prime (128253131) 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, 30115 + ... + 34108.

It is an arithmetic number, because the mean of its divisors is an integer number (32079888).

Almost surely, 2^128253331 is an apocalyptic number.

128253331 is a deficient number, since it is larger than the sum of its proper divisors (66221).

128253331 is an equidigital number, since it uses as much as digits as its factorization.

128253331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66220.

The product of its digits is 4320, while the sum is 28.

The square root of 128253331 is about 11324.8987191939. The cubic root of 128253331 is about 504.3006769626.

The spelling of 128253331 in words is "one hundred twenty-eight million, two hundred fifty-three thousand, three hundred thirty-one".