135368581 has 2 divisors, whose sum is σ = 135368582. Its totient is φ = 135368580.

The previous prime is 135368579. The next prime is 135368587. The reversal of 135368581 is 185863531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70308225 + 65060356 = 8385^2 + 8066^2 .

It is a cyclic number.

It is not a de Polignac number, because 135368581 - 2¹ = 135368579 is a prime.

It is a super-2 number, since 2×135368581² = 36649305443907122, which contains 22 as substring.

Together with 135368579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135368587) 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, 67684290 + 67684291.

It is an arithmetic number, because the mean of its divisors is an integer number (67684291).

Almost surely, 2^135368581 is an apocalyptic number.

It is an amenable number.

135368581 is a deficient number, since it is larger than the sum of its proper divisors (1).

135368581 is an equidigital number, since it uses as much as digits as its factorization.

135368581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 40.

The square root of 135368581 is about 11634.8004280263. The cubic root of 135368581 is about 513.4592224651.

The spelling of 135368581 in words is "one hundred thirty-five million, three hundred sixty-eight thousand, five hundred eighty-one".