128531593 has 2 divisors, whose sum is σ = 128531594. Its totient is φ = 128531592.

The previous prime is 128531587. The next prime is 128531609. The reversal of 128531593 is 395135821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66389904 + 62141689 = 8148^2 + 7883^2 .

It is an emirp because it is prime and its reverse (395135821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128531593 is a prime.

It is not a weakly prime, because it can be changed into another prime (128531563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64265796 + 64265797.

It is an arithmetic number, because the mean of its divisors is an integer number (64265797).

Almost surely, 2^128531593 is an apocalyptic number.

It is an amenable number.

128531593 is a deficient number, since it is larger than the sum of its proper divisors (1).

128531593 is an equidigital number, since it uses as much as digits as its factorization.

128531593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 37.

The square root of 128531593 is about 11337.1774706053. The cubic root of 128531593 is about 504.6651284476.

The spelling of 128531593 in words is "one hundred twenty-eight million, five hundred thirty-one thousand, five hundred ninety-three".