135452021281 has 2 divisors, whose sum is σ = 135452021282. Its totient is φ = 135452021280.

The previous prime is 135452021183. The next prime is 135452021297. The reversal of 135452021281 is 182120254531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134377230625 + 1074790656 = 366575^2 + 32784^2 .

It is a cyclic number.

It is not a de Polignac number, because 135452021281 - 2²³ = 135443632673 is a prime.

It is a super-2 number, since 2×135452021281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (135453021281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67726010640 + 67726010641.

It is an arithmetic number, because the mean of its divisors is an integer number (67726010641).

Almost surely, 2^135452021281 is an apocalyptic number.

It is an amenable number.

135452021281 is a deficient number, since it is larger than the sum of its proper divisors (1).

135452021281 is an equidigital number, since it uses as much as digits as its factorization.

135452021281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19200, while the sum is 34.

The spelling of 135452021281 in words is "one hundred thirty-five billion, four hundred fifty-two million, twenty-one thousand, two hundred eighty-one".