128553441 has 4 divisors (see below), whose sum is σ = 171404592. Its totient is φ = 85702292.

The previous prime is 128553431. The next prime is 128553443. The reversal of 128553441 is 144355821.

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 128553441 - 2²¹ = 126456289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128553443) 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, 21425571 + ... + 21425576.

It is an arithmetic number, because the mean of its divisors is an integer number (42851148).

Almost surely, 2^128553441 is an apocalyptic number.

It is an amenable number.

128553441 is a deficient number, since it is larger than the sum of its proper divisors (42851151).

128553441 is an equidigital number, since it uses as much as digits as its factorization.

128553441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42851150.

The product of its digits is 19200, while the sum is 33.

The square root of 128553441 is about 11338.1409851880. The cubic root of 128553441 is about 504.6937214153.

The spelling of 128553441 in words is "one hundred twenty-eight million, five hundred fifty-three thousand, four hundred forty-one".