135121201 has 2 divisors, whose sum is σ = 135121202. Its totient is φ = 135121200.

The previous prime is 135121187. The next prime is 135121211. The reversal of 135121201 is 102121531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67897600 + 67223601 = 8240^2 + 8199^2 .

It is an emirp because it is prime and its reverse (102121531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135121201 - 2⁷ = 135121073 is a prime.

It is not a weakly prime, because it can be changed into another prime (135121211) 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, 67560600 + 67560601.

It is an arithmetic number, because the mean of its divisors is an integer number (67560601).

Almost surely, 2^135121201 is an apocalyptic number.

It is an amenable number.

135121201 is a deficient number, since it is larger than the sum of its proper divisors (1).

135121201 is an equidigital number, since it uses as much as digits as its factorization.

135121201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 135121201 is about 11624.1645291178. The cubic root of 135121201 is about 513.1462571907.

Adding to 135121201 its reverse (102121531), we get a palindrome (237242732).

The spelling of 135121201 in words is "one hundred thirty-five million, one hundred twenty-one thousand, two hundred one".