128321511 has 8 divisors (see below), whose sum is σ = 171849984. Its totient is φ = 85170360.

The previous prime is 128321509. The next prime is 128321551. The reversal of 128321511 is 115123821.

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

It is not a de Polignac number, because 128321511 - 2¹ = 128321509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128321551) 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, 93535 + ... + 94896.

It is an arithmetic number, because the mean of its divisors is an integer number (21481248).

Almost surely, 2^128321511 is an apocalyptic number.

128321511 is a deficient number, since it is larger than the sum of its proper divisors (43528473).

128321511 is a wasteful number, since it uses less digits than its factorization.

128321511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188661.

The product of its digits is 480, while the sum is 24.

The square root of 128321511 is about 11327.9085006898. The cubic root of 128321511 is about 504.3900239057.

The spelling of 128321511 in words is "one hundred twenty-eight million, three hundred twenty-one thousand, five hundred eleven".