128717543 has 4 divisors (see below), whose sum is σ = 129068640. Its totient is φ = 128366448.

The previous prime is 128717539. The next prime is 128717551. The reversal of 128717543 is 345717821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 345717821 = 8761 ⋅39461.

It is a cyclic number.

It is not a de Polignac number, because 128717543 - 2² = 128717539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128717497 and 128717506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128717593) 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, 174998 + ... + 175731.

It is an arithmetic number, because the mean of its divisors is an integer number (32267160).

Almost surely, 2^128717543 is an apocalyptic number.

128717543 is a deficient number, since it is larger than the sum of its proper divisors (351097).

128717543 is an equidigital number, since it uses as much as digits as its factorization.

128717543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351096.

The product of its digits is 47040, while the sum is 38.

The square root of 128717543 is about 11345.3754014576. The cubic root of 128717543 is about 504.9083819025.

The spelling of 128717543 in words is "one hundred twenty-eight million, seven hundred seventeen thousand, five hundred forty-three".