128281771 has 6 divisors (see below), whose sum is σ = 131336340. Its totient is φ = 125296668.

The previous prime is 128281763. The next prime is 128281793. The reversal of 128281771 is 177182821.

It is not a de Polignac number, because 128281771 - 2³ = 128281763 is a prime.

It is a super-3 number, since 3×128281771³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128281771.

It is not an unprimeable number, because it can be changed into a prime (128281721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32841 + ... + 36538.

It is an arithmetic number, because the mean of its divisors is an integer number (21889390).

Almost surely, 2^128281771 is an apocalyptic number.

128281771 is a deficient number, since it is larger than the sum of its proper divisors (3054569).

128281771 is an frugal number, since it uses more digits than its factorization.

128281771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69465 (or 69422 counting only the distinct ones).

The product of its digits is 12544, while the sum is 37.

The square root of 128281771 is about 11326.1542899609. The cubic root of 128281771 is about 504.3379502018.

The spelling of 128281771 in words is "one hundred twenty-eight million, two hundred eighty-one thousand, seven hundred seventy-one".