128442901 has 4 divisors (see below), whose sum is σ = 128541600. Its totient is φ = 128344204.

The previous prime is 128442877. The next prime is 128442911. The reversal of 128442901 is 109244821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128442901 - 2¹¹ = 128440853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128442911) 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, 47371 + ... + 50008.

It is an arithmetic number, because the mean of its divisors is an integer number (32135400).

Almost surely, 2^128442901 is an apocalyptic number.

It is an amenable number.

128442901 is a deficient number, since it is larger than the sum of its proper divisors (98699).

128442901 is an equidigital number, since it uses as much as digits as its factorization.

128442901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98698.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 128442901 is about 11333.2652399915. The cubic root of 128442901 is about 504.5490219511.

The spelling of 128442901 in words is "one hundred twenty-eight million, four hundred forty-two thousand, nine hundred one".