128538959 has 2 divisors, whose sum is σ = 128538960. Its totient is φ = 128538958.

The previous prime is 128538941. The next prime is 128538979. The reversal of 128538959 is 959835821.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128538959 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128538919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64269479 + 64269480.

It is an arithmetic number, because the mean of its divisors is an integer number (64269480).

Almost surely, 2^128538959 is an apocalyptic number.

128538959 is a deficient number, since it is larger than the sum of its proper divisors (1).

128538959 is an equidigital number, since it uses as much as digits as its factorization.

128538959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 50.

The square root of 128538959 is about 11337.5023263504. The cubic root of 128538959 is about 504.6747688590.

It can be divided in two parts, 12853 and 8959, that added together give a palindrome (21812).

The spelling of 128538959 in words is "one hundred twenty-eight million, five hundred thirty-eight thousand, nine hundred fifty-nine".