128711 has 4 divisors (see below), whose sum is σ = 140424. Its totient is φ = 117000.

The previous prime is 128693. The next prime is 128717. The reversal of 128711 is 117821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 117821 = 11 ⋅10711.

It is a cyclic number.

It is not a de Polignac number, because 128711 - 2¹⁴ = 112327 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128717) 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, 5840 + ... + 5861.

It is an arithmetic number, because the mean of its divisors is an integer number (35106).

2¹²⁸⁷¹¹ is an apocalyptic number.

128711 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128711 is a deficient number, since it is larger than the sum of its proper divisors (11713).

128711 is a wasteful number, since it uses less digits than its factorization.

128711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11712.

The product of its digits is 112, while the sum is 20.

The square root of 128711 is about 358.7631530690. The cubic root of 128711 is about 50.4899826551.

The spelling of 128711 in words is "one hundred twenty-eight thousand, seven hundred eleven".