128356297 has 4 divisors (see below), whose sum is σ = 128483280. Its totient is φ = 128229316.

The previous prime is 128356279. The next prime is 128356321. The reversal of 128356297 is 792653821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128356297 - 2¹⁵ = 128323529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128353297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61963 + ... + 64000.

It is an arithmetic number, because the mean of its divisors is an integer number (32120820).

Almost surely, 2^128356297 is an apocalyptic number.

It is an amenable number.

128356297 is a deficient number, since it is larger than the sum of its proper divisors (126983).

128356297 is a wasteful number, since it uses less digits than its factorization.

128356297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126982.

The product of its digits is 181440, while the sum is 43.

The square root of 128356297 is about 11329.4438080605. The cubic root of 128356297 is about 504.4355972628.

The spelling of 128356297 in words is "one hundred twenty-eight million, three hundred fifty-six thousand, two hundred ninety-seven".