128120271 has 4 divisors (see below), whose sum is σ = 170827032. Its totient is φ = 85413512.

The previous prime is 128120243. The next prime is 128120273. The reversal of 128120271 is 172021821.

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 128120271 - 2¹⁰ = 128119247 is a prime.

It is a super-2 number, since 2×128120271² = 32829607682226882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128120273) 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, 21353376 + ... + 21353381.

It is an arithmetic number, because the mean of its divisors is an integer number (42706758).

Almost surely, 2^128120271 is an apocalyptic number.

128120271 is a deficient number, since it is larger than the sum of its proper divisors (42706761).

128120271 is an equidigital number, since it uses as much as digits as its factorization.

128120271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42706760.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 128120271 is about 11319.0225284695. The cubic root of 128120271 is about 504.1262163420.

The spelling of 128120271 in words is "one hundred twenty-eight million, one hundred twenty thousand, two hundred seventy-one".