135421129 has 2 divisors, whose sum is σ = 135421130. Its totient is φ = 135421128.

The previous prime is 135421087. The next prime is 135421177. The reversal of 135421129 is 921124531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68508729 + 66912400 = 8277^2 + 8180^2 .

It is a cyclic number.

It is not a de Polignac number, because 135421129 - 2²¹ = 133323977 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 135421097 and 135421106.

It is not a weakly prime, because it can be changed into another prime (135421229) 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, 67710564 + 67710565.

It is an arithmetic number, because the mean of its divisors is an integer number (67710565).

Almost surely, 2^135421129 is an apocalyptic number.

It is an amenable number.

135421129 is a deficient number, since it is larger than the sum of its proper divisors (1).

135421129 is an equidigital number, since it uses as much as digits as its factorization.

135421129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 28.

The square root of 135421129 is about 11637.0584341577. The cubic root of 135421129 is about 513.5256528596.

The spelling of 135421129 in words is "one hundred thirty-five million, four hundred twenty-one thousand, one hundred twenty-nine".