135258450581 has 2 divisors, whose sum is σ = 135258450582. Its totient is φ = 135258450580.

The previous prime is 135258450571. The next prime is 135258450661. The reversal of 135258450581 is 185054852531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120871647556 + 14386803025 = 347666^2 + 119945^2 .

It is an emirp because it is prime and its reverse (185054852531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135258450581 - 2¹⁴ = 135258434197 is a prime.

It is a super-4 number, since 4×135258450581⁴ (a number of 46 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135258450521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67629225290 + 67629225291.

It is an arithmetic number, because the mean of its divisors is an integer number (67629225291).

Almost surely, 2^135258450581 is an apocalyptic number.

It is an amenable number.

135258450581 is a deficient number, since it is larger than the sum of its proper divisors (1).

135258450581 is an equidigital number, since it uses as much as digits as its factorization.

135258450581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960000, while the sum is 47.

The spelling of 135258450581 in words is "one hundred thirty-five billion, two hundred fifty-eight million, four hundred fifty thousand, five hundred eighty-one".