135666281 has 2 divisors, whose sum is σ = 135666282. Its totient is φ = 135666280.

The previous prime is 135666269. The next prime is 135666319. The reversal of 135666281 is 182666531.

It is an a-pointer prime, because the next prime (135666319) can be obtained adding 135666281 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127486681 + 8179600 = 11291^2 + 2860^2 .

It is a cyclic number.

It is not a de Polignac number, because 135666281 - 2¹⁴ = 135649897 is a prime.

It is a super-2 number, since 2×135666281² = 36810679600741922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (135666481) 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, 67833140 + 67833141.

It is an arithmetic number, because the mean of its divisors is an integer number (67833141).

Almost surely, 2^135666281 is an apocalyptic number.

It is an amenable number.

135666281 is a deficient number, since it is larger than the sum of its proper divisors (1).

135666281 is an equidigital number, since it uses as much as digits as its factorization.

135666281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 135666281 is about 11647.5869174692. The cubic root of 135666281 is about 513.8353434547.

The spelling of 135666281 in words is "one hundred thirty-five million, six hundred sixty-six thousand, two hundred eighty-one".