128331011 has 4 divisors (see below), whose sum is σ = 135879912. Its totient is φ = 120782112.

The previous prime is 128331001. The next prime is 128331019. The reversal of 128331011 is 110133821.

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

It is a cyclic number.

It is not a de Polignac number, because 128331011 - 2²² = 124136707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128331019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3774425 + ... + 3774458.

It is an arithmetic number, because the mean of its divisors is an integer number (33969978).

Almost surely, 2^128331011 is an apocalyptic number.

128331011 is a deficient number, since it is larger than the sum of its proper divisors (7548901).

128331011 is an equidigital number, since it uses as much as digits as its factorization.

128331011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7548900.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 128331011 is about 11328.3278112879. The cubic root of 128331011 is about 504.4024707328.

Adding to 128331011 its reverse (110133821), we get a palindrome (238464832).

The spelling of 128331011 in words is "one hundred twenty-eight million, three hundred thirty-one thousand, eleven".