128838881 has 2 divisors, whose sum is σ = 128838882. Its totient is φ = 128838880.

The previous prime is 128838823. The next prime is 128838901. The reversal of 128838881 is 188838821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118701025 + 10137856 = 10895^2 + 3184^2 .

It is an emirp because it is prime and its reverse (188838821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128838881 - 2¹⁴ = 128822497 is a prime.

It is a super-2 number, since 2×128838881² = 33198914514664322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128838581) 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 as a sum of consecutive naturals, namely, 64419440 + 64419441.

It is an arithmetic number, because the mean of its divisors is an integer number (64419441).

Almost surely, 2^128838881 is an apocalyptic number.

It is an amenable number.

128838881 is a deficient number, since it is larger than the sum of its proper divisors (1).

128838881 is an equidigital number, since it uses as much as digits as its factorization.

128838881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 196608, while the sum is 47.

The square root of 128838881 is about 11350.7216070169. The cubic root of 128838881 is about 505.0669858533.

The spelling of 128838881 in words is "one hundred twenty-eight million, eight hundred thirty-eight thousand, eight hundred eighty-one".