128751797 has 4 divisors (see below), whose sum is σ = 128777196. Its totient is φ = 128726400.

The previous prime is 128751743. The next prime is 128751803. The reversal of 128751797 is 797157821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49434961 + 79316836 = 7031^2 + 8906^2 .

It is a cyclic number.

It is not a de Polignac number, because 128751797 - 2¹⁰ = 128750773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128751197) 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, 2204 + ... + 16197.

It is an arithmetic number, because the mean of its divisors is an integer number (32194299).

Almost surely, 2^128751797 is an apocalyptic number.

It is an amenable number.

128751797 is a deficient number, since it is larger than the sum of its proper divisors (25399).

128751797 is an equidigital number, since it uses as much as digits as its factorization.

128751797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25398.

The product of its digits is 246960, while the sum is 47.

The square root of 128751797 is about 11346.8849029150. The cubic root of 128751797 is about 504.9531662610.

The spelling of 128751797 in words is "one hundred twenty-eight million, seven hundred fifty-one thousand, seven hundred ninety-seven".