128333081 has 4 divisors (see below), whose sum is σ = 130436964. Its totient is φ = 126229200.

The previous prime is 128333069. The next prime is 128333137. The reversal of 128333081 is 180333821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180333821 = 839 ⋅214939.

It can be written as a sum of positive squares in 2 ways, for example, as 8649481 + 119683600 = 2941^2 + 10940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128333081 is a prime.

It is a super-2 number, since 2×128333081² = 32938759357905122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128333021) 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, 1051850 + ... + 1051971.

It is an arithmetic number, because the mean of its divisors is an integer number (32609241).

Almost surely, 2^128333081 is an apocalyptic number.

It is an amenable number.

128333081 is a deficient number, since it is larger than the sum of its proper divisors (2103883).

128333081 is an equidigital number, since it uses as much as digits as its factorization.

128333081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103882.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 128333081 is about 11328.4191748010. The cubic root of 128333081 is about 504.4051827494.

The spelling of 128333081 in words is "one hundred twenty-eight million, three hundred thirty-three thousand, eighty-one".