128135797 has 2 divisors, whose sum is σ = 128135798. Its totient is φ = 128135796.

The previous prime is 128135663. The next prime is 128135837. The reversal of 128135797 is 797531821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80442961 + 47692836 = 8969^2 + 6906^2 .

It is a cyclic number.

It is not a de Polignac number, because 128135797 - 2¹⁵ = 128103029 is a prime.

It is a super-3 number, since 3×128135797³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128136797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64067898 + 64067899.

It is an arithmetic number, because the mean of its divisors is an integer number (64067899).

Almost surely, 2^128135797 is an apocalyptic number.

It is an amenable number.

128135797 is a deficient number, since it is larger than the sum of its proper divisors (1).

128135797 is an equidigital number, since it uses as much as digits as its factorization.

128135797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 43.

The square root of 128135797 is about 11319.7083442993. The cubic root of 128135797 is about 504.1465793635.

The spelling of 128135797 in words is "one hundred twenty-eight million, one hundred thirty-five thousand, seven hundred ninety-seven".