128515321 has 8 divisors (see below), whose sum is σ = 140349600. Its totient is φ = 116706240.

The previous prime is 128515273. The next prime is 128515337. The reversal of 128515321 is 123515821.

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 128515321 - 2¹³ = 128507129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128515321.

It is not an unprimeable number, because it can be changed into a prime (128515721) 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, 5310 + ... + 16888.

It is an arithmetic number, because the mean of its divisors is an integer number (17543700).

Almost surely, 2^128515321 is an apocalyptic number.

128515321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128515321 is a deficient number, since it is larger than the sum of its proper divisors (11834279).

128515321 is a wasteful number, since it uses less digits than its factorization.

128515321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12599.

The product of its digits is 2400, while the sum is 28.

The square root of 128515321 is about 11336.4598089527. The cubic root of 128515321 is about 504.6438308108.

The spelling of 128515321 in words is "one hundred twenty-eight million, five hundred fifteen thousand, three hundred twenty-one".