128514561 has 32 divisors (see below), whose sum is σ = 204054528. Its totient is φ = 70398720.

The previous prime is 128514553. The next prime is 128514563. The reversal of 128514561 is 165415821.

It is not a de Polignac number, because 128514561 - 2³ = 128514553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128514563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72690 + ... + 74436.

It is an arithmetic number, because the mean of its divisors is an integer number (6376704).

Almost surely, 2^128514561 is an apocalyptic number.

It is an amenable number.

128514561 is a deficient number, since it is larger than the sum of its proper divisors (75539967).

128514561 is a wasteful number, since it uses less digits than its factorization.

128514561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901.

The product of its digits is 9600, while the sum is 33.

The square root of 128514561 is about 11336.4262887384. The cubic root of 128514561 is about 504.6428360395.

The spelling of 128514561 in words is "one hundred twenty-eight million, five hundred fourteen thousand, five hundred sixty-one".