128235251 has 8 divisors (see below), whose sum is σ = 132962304. Its totient is φ = 123545160.

The previous prime is 128235241. The next prime is 128235257. The reversal of 128235251 is 152532821.

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 128235251 - 2²² = 124040947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128235257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2075 + ... + 16148.

It is an arithmetic number, because the mean of its divisors is an integer number (16620288).

Almost surely, 2^128235251 is an apocalyptic number.

128235251 is a deficient number, since it is larger than the sum of its proper divisors (4727053).

128235251 is a wasteful number, since it uses less digits than its factorization.

128235251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18481.

The product of its digits is 4800, while the sum is 29.

The square root of 128235251 is about 11324.1004499254. The cubic root of 128235251 is about 504.2769785925.

The spelling of 128235251 in words is "one hundred twenty-eight million, two hundred thirty-five thousand, two hundred fifty-one".