128959511 has 2 divisors, whose sum is σ = 128959512. Its totient is φ = 128959510.

The previous prime is 128959489. The next prime is 128959513. The reversal of 128959511 is 115959821.

It is a strong prime.

It is an emirp because it is prime and its reverse (115959821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128959511 is a prime.

Together with 128959513, 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 (128959513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64479755 + 64479756.

It is an arithmetic number, because the mean of its divisors is an integer number (64479756).

Almost surely, 2^128959511 is an apocalyptic number.

128959511 is a deficient number, since it is larger than the sum of its proper divisors (1).

128959511 is an equidigital number, since it uses as much as digits as its factorization.

128959511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 41.

The square root of 128959511 is about 11356.0341228793. The cubic root of 128959511 is about 505.2245656800.

The spelling of 128959511 in words is "one hundred twenty-eight million, nine hundred fifty-nine thousand, five hundred eleven".