135638281 has 2 divisors, whose sum is σ = 135638282. Its totient is φ = 135638280.

The previous prime is 135638273. The next prime is 135638309. The reversal of 135638281 is 182836531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121881600 + 13756681 = 11040^2 + 3709^2 .

It is an emirp because it is prime and its reverse (182836531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135638281 - 2³ = 135638273 is a prime.

It is a super-2 number, since 2×135638281² = 36795486545269922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 135638281.

It is not a weakly prime, because it can be changed into another prime (135632281) 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, 67819140 + 67819141.

It is an arithmetic number, because the mean of its divisors is an integer number (67819141).

Almost surely, 2^135638281 is an apocalyptic number.

It is an amenable number.

135638281 is a deficient number, since it is larger than the sum of its proper divisors (1).

135638281 is an equidigital number, since it uses as much as digits as its factorization.

135638281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 135638281 is about 11646.3848897415. The cubic root of 135638281 is about 513.7999910704.

The spelling of 135638281 in words is "one hundred thirty-five million, six hundred thirty-eight thousand, two hundred eighty-one".