128531553 has 8 divisors (see below), whose sum is σ = 171453888. Its totient is φ = 85648464.

The previous prime is 128531551. The next prime is 128531563. The reversal of 128531553 is 355135821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128531553 - 2¹ = 128531551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128531551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1050 + ... + 16067.

It is an arithmetic number, because the mean of its divisors is an integer number (21431736).

Almost surely, 2^128531553 is an apocalyptic number.

It is an amenable number.

128531553 is a deficient number, since it is larger than the sum of its proper divisors (42922335).

128531553 is a wasteful number, since it uses less digits than its factorization.

128531553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19623.

The product of its digits is 18000, while the sum is 33.

The square root of 128531553 is about 11337.1757064976. The cubic root of 128531553 is about 504.6650760957.

The spelling of 128531553 in words is "one hundred twenty-eight million, five hundred thirty-one thousand, five hundred fifty-three".