128601251 has 2 divisors, whose sum is σ = 128601252. Its totient is φ = 128601250.

The previous prime is 128601229. The next prime is 128601289. The reversal of 128601251 is 152106821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128601251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128601251.

It is not a weakly prime, because it can be changed into another prime (128501251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64300625 + 64300626.

It is an arithmetic number, because the mean of its divisors is an integer number (64300626).

Almost surely, 2^128601251 is an apocalyptic number.

128601251 is a deficient number, since it is larger than the sum of its proper divisors (1).

128601251 is an equidigital number, since it uses as much as digits as its factorization.

128601251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 128601251 is about 11340.2491595203. The cubic root of 128601251 is about 504.7562801352.

The spelling of 128601251 in words is "one hundred twenty-eight million, six hundred one thousand, two hundred fifty-one".