135820897 has 2 divisors, whose sum is σ = 135820898. Its totient is φ = 135820896.

The previous prime is 135820877. The next prime is 135820901. The reversal of 135820897 is 798028531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89567296 + 46253601 = 9464^2 + 6801^2 .

It is an emirp because it is prime and its reverse (798028531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135820897 is a prime.

It is equal to p_7689166 and since 135820897 and 7689166 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (135820877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67910448 + 67910449.

It is an arithmetic number, because the mean of its divisors is an integer number (67910449).

Almost surely, 2^135820897 is an apocalyptic number.

It is an amenable number.

135820897 is a deficient number, since it is larger than the sum of its proper divisors (1).

135820897 is an equidigital number, since it uses as much as digits as its factorization.

135820897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 135820897 is about 11654.2222820744. Note that the first 4 decimals coincide. The cubic root of 135820897 is about 514.0304717813.

The spelling of 135820897 in words is "one hundred thirty-five million, eight hundred twenty thousand, eight hundred ninety-seven".