135199121 has 2 divisors, whose sum is σ = 135199122. Its totient is φ = 135199120.

The previous prime is 135199087. The next prime is 135199151. The reversal of 135199121 is 121991531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102010000 + 33189121 = 10100^2 + 5761^2 .

It is a cyclic number.

It is not a de Polignac number, because 135199121 - 2¹⁰ = 135198097 is a prime.

It is not a weakly prime, because it can be changed into another prime (135199151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67599560 + 67599561.

It is an arithmetic number, because the mean of its divisors is an integer number (67599561).

Almost surely, 2^135199121 is an apocalyptic number.

It is an amenable number.

135199121 is a deficient number, since it is larger than the sum of its proper divisors (1).

135199121 is an equidigital number, since it uses as much as digits as its factorization.

135199121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 32.

The square root of 135199121 is about 11627.5156847884. The cubic root of 135199121 is about 513.2448764862.

The spelling of 135199121 in words is "one hundred thirty-five million, one hundred ninety-nine thousand, one hundred twenty-one".