128181227 has 4 divisors (see below), whose sum is σ = 129190656. Its totient is φ = 127171800.

The previous prime is 128181181. The next prime is 128181233. The reversal of 128181227 is 722181821.

It is a happy number.

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 128181227 - 2¹⁸ = 127919083 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128181193 and 128181202.

It is not an unprimeable number, because it can be changed into a prime (128181527) 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, 504524 + ... + 504777.

It is an arithmetic number, because the mean of its divisors is an integer number (32297664).

Almost surely, 2^128181227 is an apocalyptic number.

128181227 is a deficient number, since it is larger than the sum of its proper divisors (1009429).

128181227 is a wasteful number, since it uses less digits than its factorization.

128181227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009428.

The product of its digits is 3584, while the sum is 32.

The square root of 128181227 is about 11321.7148436092. The cubic root of 128181227 is about 504.2061533295.

The spelling of 128181227 in words is "one hundred twenty-eight million, one hundred eighty-one thousand, two hundred twenty-seven".