128613839 has 2 divisors, whose sum is σ = 128613840. Its totient is φ = 128613838.

The previous prime is 128613833. The next prime is 128613841. The reversal of 128613839 is 938316821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128613839 is a prime.

Together with 128613841, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 128613796 and 128613805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128613833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64306919 + 64306920.

It is an arithmetic number, because the mean of its divisors is an integer number (64306920).

Almost surely, 2^128613839 is an apocalyptic number.

128613839 is a deficient number, since it is larger than the sum of its proper divisors (1).

128613839 is an equidigital number, since it uses as much as digits as its factorization.

128613839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 128613839 is about 11340.8041601996. The cubic root of 128613839 is about 504.7727487794.

The spelling of 128613839 in words is "one hundred twenty-eight million, six hundred thirteen thousand, eight hundred thirty-nine".