128323519 has 2 divisors, whose sum is σ = 128323520. Its totient is φ = 128323518.

The previous prime is 128323513. The next prime is 128323523. The reversal of 128323519 is 915323821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128323519 - 2⁵ = 128323487 is a prime.

It is a super-2 number, since 2×128323519² = 32933851057086722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128323513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64161759 + 64161760.

It is an arithmetic number, because the mean of its divisors is an integer number (64161760).

Almost surely, 2^128323519 is an apocalyptic number.

128323519 is a deficient number, since it is larger than the sum of its proper divisors (1).

128323519 is an equidigital number, since it uses as much as digits as its factorization.

128323519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 34.

The square root of 128323519 is about 11327.9971310025. The cubic root of 128323519 is about 504.3926548231.

The spelling of 128323519 in words is "one hundred twenty-eight million, three hundred twenty-three thousand, five hundred nineteen".