128471 has 4 divisors (see below), whose sum is σ = 146832. Its totient is φ = 110112.

The previous prime is 128467. The next prime is 128473. The reversal of 128471 is 174821.

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

It is a cyclic number.

It is not a de Polignac number, because 128471 - 2² = 128467 is a prime.

It is a super-3 number, since 3×128471³ = 6361163650293333, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9170 + ... + 9183.

It is an arithmetic number, because the mean of its divisors is an integer number (36708).

2¹²⁸⁴⁷¹ is an apocalyptic number.

128471 is a deficient number, since it is larger than the sum of its proper divisors (18361).

128471 is an equidigital number, since it uses as much as digits as its factorization.

128471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18360.

The product of its digits is 448, while the sum is 23.

The square root of 128471 is about 358.4285144907. The cubic root of 128471 is about 50.4585812071.

The spelling of 128471 in words is "one hundred twenty-eight thousand, four hundred seventy-one".