128051971 has 8 divisors (see below), whose sum is σ = 133735680. Its totient is φ = 122377992.

The previous prime is 128051951. The next prime is 128051977. The reversal of 128051971 is 179150821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128051971 - 2⁹ = 128051459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128051977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41736 + ... + 44698.

It is an arithmetic number, because the mean of its divisors is an integer number (16716960).

Almost surely, 2^128051971 is an apocalyptic number.

128051971 is a deficient number, since it is larger than the sum of its proper divisors (5683709).

128051971 is a wasteful number, since it uses less digits than its factorization.

128051971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4865.

The product of its (nonzero) digits is 5040, while the sum is 34.

The square root of 128051971 is about 11316.0050812997. The cubic root of 128051971 is about 504.0366183921.

The spelling of 128051971 in words is "one hundred twenty-eight million, fifty-one thousand, nine hundred seventy-one".