128519 has 2 divisors, whose sum is σ = 128520. Its totient is φ = 128518.

The previous prime is 128509. The next prime is 128521. The reversal of 128519 is 915821.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128519 - 2¹⁶ = 62983 is a prime.

It is a super-2 number, since 2×128519² = 33034266722, which contains 22 as substring.

Together with 128521, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64259 + 64260.

It is an arithmetic number, because the mean of its divisors is an integer number (64260).

2¹²⁸⁵¹⁹ is an apocalyptic number.

128519 is a deficient number, since it is larger than the sum of its proper divisors (1).

128519 is an equidigital number, since it uses as much as digits as its factorization.

128519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 26.

The square root of 128519 is about 358.4954671959. The cubic root of 128519 is about 50.4648646234.

The spelling of 128519 in words is "one hundred twenty-eight thousand, five hundred nineteen".