128279141 has 4 divisors (see below), whose sum is σ = 128642892. Its totient is φ = 127915392.

The previous prime is 128279117. The next prime is 128279149. The reversal of 128279141 is 141972821.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27196225 + 101082916 = 5215^2 + 10054^2 .

It is a cyclic number.

It is not a de Polignac number, because 128279141 - 2⁶ = 128279077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128279149) 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, 181346 + ... + 182051.

It is an arithmetic number, because the mean of its divisors is an integer number (32160723).

Almost surely, 2^128279141 is an apocalyptic number.

It is an amenable number.

128279141 is a deficient number, since it is larger than the sum of its proper divisors (363751).

128279141 is an equidigital number, since it uses as much as digits as its factorization.

128279141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363750.

The product of its digits is 8064, while the sum is 35.

The square root of 128279141 is about 11326.0381864092. The cubic root of 128279141 is about 504.3345035758.

The spelling of 128279141 in words is "one hundred twenty-eight million, two hundred seventy-nine thousand, one hundred forty-one".