135759521 has 2 divisors, whose sum is σ = 135759522. Its totient is φ = 135759520.

The previous prime is 135759517. The next prime is 135759581. The reversal of 135759521 is 125957531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98109025 + 37650496 = 9905^2 + 6136^2 .

It is a cyclic number.

It is not a de Polignac number, because 135759521 - 2² = 135759517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (135759511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67879760 + 67879761.

It is an arithmetic number, because the mean of its divisors is an integer number (67879761).

Almost surely, 2^135759521 is an apocalyptic number.

It is an amenable number.

135759521 is a deficient number, since it is larger than the sum of its proper divisors (1).

135759521 is an equidigital number, since it uses as much as digits as its factorization.

135759521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47250, while the sum is 38.

The square root of 135759521 is about 11651.5887757850. The cubic root of 135759521 is about 513.9530318380.

The spelling of 135759521 in words is "one hundred thirty-five million, seven hundred fifty-nine thousand, five hundred twenty-one".