128560001 has 8 divisors (see below), whose sum is σ = 138354984. Its totient is φ = 119013120.

The previous prime is 128559953. The next prime is 128560013. The reversal of 128560001 is 100065821.

128560001 = 1928² + 1929² + ... + 1961².

It can be written as a sum of positive squares in 4 ways, for example, as 14070001 + 114490000 = 3751^2 + 10700^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128560001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128560021) 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, 60950 + ... + 63023.

It is an arithmetic number, because the mean of its divisors is an integer number (17294373).

Almost surely, 2^128560001 is an apocalyptic number.

It is an amenable number.

128560001 is a deficient number, since it is larger than the sum of its proper divisors (9794983).

128560001 is a wasteful number, since it uses less digits than its factorization.

128560001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124051.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 128560001 is about 11338.4302705445. The cubic root of 128560001 is about 504.7023060020.

The spelling of 128560001 in words is "one hundred twenty-eight million, five hundred sixty thousand, one".