135127121 has 2 divisors, whose sum is σ = 135127122. Its totient is φ = 135127120.

The previous prime is 135127117. The next prime is 135127127. The reversal of 135127121 is 121721531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123321025 + 11806096 = 11105^2 + 3436^2 .

It is a cyclic number.

It is not a de Polignac number, because 135127121 - 2² = 135127117 is a prime.

It is not a weakly prime, because it can be changed into another prime (135127127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67563560 + 67563561.

It is an arithmetic number, because the mean of its divisors is an integer number (67563561).

Almost surely, 2^135127121 is an apocalyptic number.

It is an amenable number.

135127121 is a deficient number, since it is larger than the sum of its proper divisors (1).

135127121 is an equidigital number, since it uses as much as digits as its factorization.

135127121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 23.

The square root of 135127121 is about 11624.4191682854. The cubic root of 135127121 is about 513.1537511577.

Adding to 135127121 its reverse (121721531), we get a palindrome (256848652).

The spelling of 135127121 in words is "one hundred thirty-five million, one hundred twenty-seven thousand, one hundred twenty-one".