128937511321 has 8 divisors (see below), whose sum is σ = 129661950600. Its totient is φ = 128213205120.

The previous prime is 128937511277. The next prime is 128937511327. The reversal of 128937511321 is 123115739821.

It can be written as a sum of positive squares in 4 ways, for example, as 6024864400 + 122912646921 = 77620^2 + 350589^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 128937511321 - 2¹³ = 128937503129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128937511327) 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, 2411445 + ... + 2464333.

It is an arithmetic number, because the mean of its divisors is an integer number (16207743825).

Almost surely, 2^128937511321 is an apocalyptic number.

It is an amenable number.

128937511321 is a deficient number, since it is larger than the sum of its proper divisors (724439279).

128937511321 is a wasteful number, since it uses less digits than its factorization.

128937511321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66539.

The product of its digits is 90720, while the sum is 43.

The spelling of 128937511321 in words is "one hundred twenty-eight billion, nine hundred thirty-seven million, five hundred eleven thousand, three hundred twenty-one".