128011551 has 8 divisors (see below), whose sum is σ = 170839344. Its totient is φ = 85262400.

The previous prime is 128011549. The next prime is 128011591. The reversal of 128011551 is 155110821.

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

It is not a de Polignac number, because 128011551 - 2¹ = 128011549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128011591) 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, 15750 + ... + 22451.

It is an arithmetic number, because the mean of its divisors is an integer number (21354918).

Almost surely, 2^128011551 is an apocalyptic number.

128011551 is a deficient number, since it is larger than the sum of its proper divisors (42827793).

128011551 is a wasteful number, since it uses less digits than its factorization.

128011551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39321.

The product of its (nonzero) digits is 400, while the sum is 24.

The square root of 128011551 is about 11314.2189743703. The cubic root of 128011551 is about 503.9835792395.

The spelling of 128011551 in words is "one hundred twenty-eight million, eleven thousand, five hundred fifty-one".