128234440001 has 4 divisors (see below), whose sum is σ = 135777642372. Its totient is φ = 120691237632.

The previous prime is 128234439973. The next prime is 128234440003. The reversal of 128234440001 is 100044432821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100044432821 = 1867 ⋅53585663.

It can be written as a sum of positive squares in 2 ways, for example, as 115600680001 + 12633760000 = 340001^2 + 112400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128234440001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128234440003) 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, 3771601160 + ... + 3771601193.

It is an arithmetic number, because the mean of its divisors is an integer number (33944410593).

Almost surely, 2^128234440001 is an apocalyptic number.

It is an amenable number.

128234440001 is a deficient number, since it is larger than the sum of its proper divisors (7543202371).

128234440001 is an equidigital number, since it uses as much as digits as its factorization.

128234440001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7543202370.

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 128234440001 its reverse (100044432821), we get a palindrome (228278872822).

The spelling of 128234440001 in words is "one hundred twenty-eight billion, two hundred thirty-four million, four hundred forty thousand, one".