135998129 has 2 divisors, whose sum is σ = 135998130. Its totient is φ = 135998128.

The previous prime is 135998117. The next prime is 135998167. The reversal of 135998129 is 921899531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93161104 + 42837025 = 9652^2 + 6545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135998129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (135998329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67999064 + 67999065.

It is an arithmetic number, because the mean of its divisors is an integer number (67999065).

Almost surely, 2^135998129 is an apocalyptic number.

It is an amenable number.

135998129 is a deficient number, since it is larger than the sum of its proper divisors (1).

135998129 is an equidigital number, since it uses as much as digits as its factorization.

135998129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 47.

The square root of 135998129 is about 11661.8235709515. The cubic root of 135998129 is about 514.2539598523.

The spelling of 135998129 in words is "one hundred thirty-five million, nine hundred ninety-eight thousand, one hundred twenty-nine".