135166121 has 2 divisors, whose sum is σ = 135166122. Its totient is φ = 135166120.

The previous prime is 135166093. The next prime is 135166127. The reversal of 135166121 is 121661531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97515625 + 37650496 = 9875^2 + 6136^2 .

It is an emirp because it is prime and its reverse (121661531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135166121 - 2¹⁴ = 135149737 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (135166127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67583060 + 67583061.

It is an arithmetic number, because the mean of its divisors is an integer number (67583061).

Almost surely, 2^135166121 is an apocalyptic number.

It is an amenable number.

135166121 is a deficient number, since it is larger than the sum of its proper divisors (1).

135166121 is an equidigital number, since it uses as much as digits as its factorization.

135166121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 26.

The square root of 135166121 is about 11626.0965504334. The cubic root of 135166121 is about 513.2031147276.

The spelling of 135166121 in words is "one hundred thirty-five million, one hundred sixty-six thousand, one hundred twenty-one".