128118641 has 4 divisors (see below), whose sum is σ = 146421312. Its totient is φ = 109815972.

The previous prime is 128118637. The next prime is 128118643. The reversal of 128118641 is 146811821.

It is a happy number.

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 not a de Polignac number, because 128118641 - 2² = 128118637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128118598 and 128118607.

It is not an unprimeable number, because it can be changed into a prime (128118643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9151325 + ... + 9151338.

It is an arithmetic number, because the mean of its divisors is an integer number (36605328).

Almost surely, 2^128118641 is an apocalyptic number.

It is an amenable number.

128118641 is a deficient number, since it is larger than the sum of its proper divisors (18302671).

128118641 is an equidigital number, since it uses as much as digits as its factorization.

128118641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18302670.

The product of its digits is 3072, while the sum is 32.

The square root of 128118641 is about 11318.9505255567. The cubic root of 128118641 is about 504.1240784310.

The spelling of 128118641 in words is "one hundred twenty-eight million, one hundred eighteen thousand, six hundred forty-one".