135725561 has 2 divisors, whose sum is σ = 135725562. Its totient is φ = 135725560.

The previous prime is 135725453. The next prime is 135725567. The reversal of 135725561 is 165527531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125865961 + 9859600 = 11219^2 + 3140^2 .

It is a cyclic number.

It is not a de Polignac number, because 135725561 - 2¹⁸ = 135463417 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (135725567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67862780 + 67862781.

It is an arithmetic number, because the mean of its divisors is an integer number (67862781).

Almost surely, 2^135725561 is an apocalyptic number.

It is an amenable number.

135725561 is a deficient number, since it is larger than the sum of its proper divisors (1).

135725561 is an equidigital number, since it uses as much as digits as its factorization.

135725561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31500, while the sum is 35.

The square root of 135725561 is about 11650.1313726498. The cubic root of 135725561 is about 513.9101734553.

The spelling of 135725561 in words is "one hundred thirty-five million, seven hundred twenty-five thousand, five hundred sixty-one".