135221897 has 2 divisors, whose sum is σ = 135221898. Its totient is φ = 135221896.

The previous prime is 135221873. The next prime is 135221941. The reversal of 135221897 is 798122531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131423296 + 3798601 = 11464^2 + 1949^2 .

It is a cyclic number.

It is not a de Polignac number, because 135221897 - 2²⁴ = 118444681 is a prime.

It is a super-2 number, since 2×135221897² = 36569922856557218, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 135221897.

It is not a weakly prime, because it can be changed into another prime (135221837) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67610948 + 67610949.

It is an arithmetic number, because the mean of its divisors is an integer number (67610949).

Almost surely, 2^135221897 is an apocalyptic number.

It is an amenable number.

135221897 is a deficient number, since it is larger than the sum of its proper divisors (1).

135221897 is an equidigital number, since it uses as much as digits as its factorization.

135221897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 135221897 is about 11628.4950445017. The cubic root of 135221897 is about 513.2736957291.

The spelling of 135221897 in words is "one hundred thirty-five million, two hundred twenty-one thousand, eight hundred ninety-seven".