136745561 has 2 divisors, whose sum is σ = 136745562. Its totient is φ = 136745560.

The previous prime is 136745549. The next prime is 136745579. The reversal of 136745561 is 165547631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104755225 + 31990336 = 10235^2 + 5656^2 .

It is a cyclic number.

It is not a de Polignac number, because 136745561 - 2¹⁰ = 136744537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (136045561) 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, 68372780 + 68372781.

It is an arithmetic number, because the mean of its divisors is an integer number (68372781).

Almost surely, 2^136745561 is an apocalyptic number.

It is an amenable number.

136745561 is a deficient number, since it is larger than the sum of its proper divisors (1).

136745561 is an equidigital number, since it uses as much as digits as its factorization.

136745561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 38.

The square root of 136745561 is about 11693.8257640517. The cubic root of 136745561 is about 515.1943351795.

The spelling of 136745561 in words is "one hundred thirty-six million, seven hundred forty-five thousand, five hundred sixty-one".