128700000001 has 4 divisors (see below), whose sum is σ = 128700742212. Its totient is φ = 128699257792.

The previous prime is 128699999983. The next prime is 128700000017. The reversal of 128700000001 is 100000007821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 50423151601 + 78276848400 = 224551^2 + 279780^2 .

It is a cyclic number.

It is not a de Polignac number, because 128700000001 - 2⁵ = 128699999969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128700004001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43101 + ... + 509173.

It is an arithmetic number, because the mean of its divisors is an integer number (32175185553).

Almost surely, 2^128700000001 is an apocalyptic number.

It is an amenable number.

128700000001 is a deficient number, since it is larger than the sum of its proper divisors (742211).

128700000001 is an equidigital number, since it uses as much as digits as its factorization.

128700000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742210.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 128700000001 its reverse (100000007821), we get a palindrome (228700007822).

The spelling of 128700000001 in words is "one hundred twenty-eight billion, seven hundred million, one", and thus it is an aban number.