128497 has 4 divisors (see below), whose sum is σ = 135280. Its totient is φ = 121716.

The previous prime is 128489. The next prime is 128509. The reversal of 128497 is 794821.

128497 is nontrivially palindromic in base 16.

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, and also an emirpimes, since its reverse is a distinct semiprime: 794821 = 67 ⋅11863.

It is a cyclic number.

It is not a de Polignac number, because 128497 - 2³ = 128489 is a prime.

It is a super-2 number, since 2×128497² = 33022958018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128437) 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, 3363 + ... + 3400.

It is an arithmetic number, because the mean of its divisors is an integer number (33820).

2¹²⁸⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

128497 is a deficient number, since it is larger than the sum of its proper divisors (6783).

128497 is an equidigital number, since it uses as much as digits as its factorization.

128497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6782.

The product of its digits is 4032, while the sum is 31.

The square root of 128497 is about 358.4647820916. The cubic root of 128497 is about 50.4619849185.

It can be divided in two parts, 128 and 497, that added together give a 4-th power (625 = 5⁴).

The spelling of 128497 in words is "one hundred twenty-eight thousand, four hundred ninety-seven".