135404681 has 2 divisors, whose sum is σ = 135404682. Its totient is φ = 135404680.

The previous prime is 135404669. The next prime is 135404701. The reversal of 135404681 is 186404531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112699456 + 22705225 = 10616^2 + 4765^2 .

It is an emirp because it is prime and its reverse (186404531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135404681 - 2⁶ = 135404617 is a prime.

It is a super-2 number, since 2×135404681² = 36668855273423522, which contains 22 as substring.

It is equal to p_7667060 and since 135404681 and 7667060 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (135404081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67702340 + 67702341.

It is an arithmetic number, because the mean of its divisors is an integer number (67702341).

Almost surely, 2^135404681 is an apocalyptic number.

It is an amenable number.

135404681 is a deficient number, since it is larger than the sum of its proper divisors (1).

135404681 is an equidigital number, since it uses as much as digits as its factorization.

135404681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 135404681 is about 11636.3517048945. The cubic root of 135404681 is about 513.5048613923.

The spelling of 135404681 in words is "one hundred thirty-five million, four hundred four thousand, six hundred eighty-one".