128771801 has 4 divisors (see below), whose sum is σ = 128801232. Its totient is φ = 128742372.

The previous prime is 128771767. The next prime is 128771809. The reversal of 128771801 is 108177821.

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 128771801 - 2¹⁸ = 128509657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128771809) 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, 6695 + ... + 17388.

It is an arithmetic number, because the mean of its divisors is an integer number (32200308).

Almost surely, 2^128771801 is an apocalyptic number.

It is an amenable number.

128771801 is a deficient number, since it is larger than the sum of its proper divisors (29431).

128771801 is an equidigital number, since it uses as much as digits as its factorization.

128771801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29430.

The product of its (nonzero) digits is 6272, while the sum is 35.

The square root of 128771801 is about 11347.7663440873. The cubic root of 128771801 is about 504.9793162133.

The spelling of 128771801 in words is "one hundred twenty-eight million, seven hundred seventy-one thousand, eight hundred one".