135302128781 has 2 divisors, whose sum is σ = 135302128782. Its totient is φ = 135302128780.

The previous prime is 135302128777. The next prime is 135302128789. The reversal of 135302128781 is 187821203531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109865068681 + 25437060100 = 331459^2 + 159490^2 .

It is a cyclic number.

It is not a de Polignac number, because 135302128781 - 2² = 135302128777 is a prime.

It is a super-2 number, since 2×135302128781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135302128789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67651064390 + 67651064391.

It is an arithmetic number, because the mean of its divisors is an integer number (67651064391).

Almost surely, 2^135302128781 is an apocalyptic number.

It is an amenable number.

135302128781 is a deficient number, since it is larger than the sum of its proper divisors (1).

135302128781 is an equidigital number, since it uses as much as digits as its factorization.

135302128781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 135302128781 in words is "one hundred thirty-five billion, three hundred two million, one hundred twenty-eight thousand, seven hundred eighty-one".