135128849 has 2 divisors, whose sum is σ = 135128850. Its totient is φ = 135128848.

The previous prime is 135128827. The next prime is 135128867. The reversal of 135128849 is 948821531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114490000 + 20638849 = 10700^2 + 4543^2 .

It is a cyclic number.

It is not a de Polignac number, because 135128849 - 2⁸ = 135128593 is a prime.

It is not a weakly prime, because it can be changed into another prime (135124849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67564424 + 67564425.

It is an arithmetic number, because the mean of its divisors is an integer number (67564425).

Almost surely, 2^135128849 is an apocalyptic number.

It is an amenable number.

135128849 is a deficient number, since it is larger than the sum of its proper divisors (1).

135128849 is an equidigital number, since it uses as much as digits as its factorization.

135128849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 135128849 is about 11624.4934943420. The cubic root of 135128849 is about 513.1559385447.

The spelling of 135128849 in words is "one hundred thirty-five million, one hundred twenty-eight thousand, eight hundred forty-nine".