135784281389 has 2 divisors, whose sum is σ = 135784281390. Its totient is φ = 135784281388.

The previous prime is 135784281331. The next prime is 135784281401. The reversal of 135784281389 is 983182487531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83769724900 + 52014556489 = 289430^2 + 228067^2 .

It is a cyclic number.

It is not a de Polignac number, because 135784281389 - 2⁸ = 135784281133 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135784281319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67892140694 + 67892140695.

It is an arithmetic number, because the mean of its divisors is an integer number (67892140695).

Almost surely, 2^135784281389 is an apocalyptic number.

It is an amenable number.

135784281389 is a deficient number, since it is larger than the sum of its proper divisors (1).

135784281389 is an equidigital number, since it uses as much as digits as its factorization.

135784281389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11612160, while the sum is 59.

The spelling of 135784281389 in words is "one hundred thirty-five billion, seven hundred eighty-four million, two hundred eighty-one thousand, three hundred eighty-nine".