135661417 has 2 divisors, whose sum is σ = 135661418. Its totient is φ = 135661416.

The previous prime is 135661367. The next prime is 135661447. The reversal of 135661417 is 714166531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75272976 + 60388441 = 8676^2 + 7771^2 .

It is a cyclic number.

It is not a de Polignac number, because 135661417 - 2⁷ = 135661289 is a prime.

It is not a weakly prime, because it can be changed into another prime (135661447) 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, 67830708 + 67830709.

It is an arithmetic number, because the mean of its divisors is an integer number (67830709).

Almost surely, 2^135661417 is an apocalyptic number.

It is an amenable number.

135661417 is a deficient number, since it is larger than the sum of its proper divisors (1).

135661417 is an equidigital number, since it uses as much as digits as its factorization.

135661417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 34.

The square root of 135661417 is about 11647.3781169841. The cubic root of 135661417 is about 513.8292025897.

The spelling of 135661417 in words is "one hundred thirty-five million, six hundred sixty-one thousand, four hundred seventeen".