128750251 has 16 divisors (see below), whose sum is σ = 161625600. Its totient is φ = 100001088.

The previous prime is 128750243. The next prime is 128750257. The reversal of 128750251 is 152057821.

It is a cyclic number.

It is not a de Polignac number, because 128750251 - 2³ = 128750243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128750257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17986 + ... + 24103.

It is an arithmetic number, because the mean of its divisors is an integer number (10101600).

Almost surely, 2^128750251 is an apocalyptic number.

128750251 is a deficient number, since it is larger than the sum of its proper divisors (32875349).

128750251 is a wasteful number, since it uses less digits than its factorization.

128750251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42138.

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 128750251 is about 11346.8167782863. The cubic root of 128750251 is about 504.9511451611.

The spelling of 128750251 in words is "one hundred twenty-eight million, seven hundred fifty thousand, two hundred fifty-one".