128426171 has 4 divisors (see below), whose sum is σ = 128463144. Its totient is φ = 128389200.

The previous prime is 128426161. The next prime is 128426191. The reversal of 128426171 is 171624821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 171624821 = 71 ⋅2417251.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128426171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128426101) 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, 12665 + ... + 20426.

It is an arithmetic number, because the mean of its divisors is an integer number (32115786).

Almost surely, 2^128426171 is an apocalyptic number.

128426171 is a deficient number, since it is larger than the sum of its proper divisors (36973).

128426171 is an equidigital number, since it uses as much as digits as its factorization.

128426171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36972.

The product of its digits is 5376, while the sum is 32.

The square root of 128426171 is about 11332.5271232854. The cubic root of 128426171 is about 504.5271147544.

The spelling of 128426171 in words is "one hundred twenty-eight million, four hundred twenty-six thousand, one hundred seventy-one".