136243000561 has 2 divisors, whose sum is σ = 136243000562. Its totient is φ = 136243000560.

The previous prime is 136243000547. The next prime is 136243000573. The reversal of 136243000561 is 165000342631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89913021025 + 46329979536 = 299855^2 + 215244^2 .

It is a cyclic number.

It is not a de Polignac number, because 136243000561 - 2⁷ = 136243000433 is a prime.

It is not a weakly prime, because it can be changed into another prime (136243000511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68121500280 + 68121500281.

It is an arithmetic number, because the mean of its divisors is an integer number (68121500281).

Almost surely, 2^136243000561 is an apocalyptic number.

136243000561 is the 165072-nd centered decagonal number.

It is an amenable number.

136243000561 is a deficient number, since it is larger than the sum of its proper divisors (1).

136243000561 is an equidigital number, since it uses as much as digits as its factorization.

136243000561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 136243000561 in words is "one hundred thirty-six billion, two hundred forty-three million, five hundred sixty-one", and thus it is an aban number.