9685135781 has 2 divisors, whose sum is σ = 9685135782. Its totient is φ = 9685135780.

The previous prime is 9685135777. The next prime is 9685135819. The reversal of 9685135781 is 1875315869.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6911428225 + 2773707556 = 83135^2 + 52666^2 .

It is a cyclic number.

It is not a de Polignac number, because 9685135781 - 2² = 9685135777 is a prime.

It is a super-2 number, since 2×9685135781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9685135751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4842567890 + 4842567891.

It is an arithmetic number, because the mean of its divisors is an integer number (4842567891).

Almost surely, 2^9685135781 is an apocalyptic number.

It is an amenable number.

9685135781 is a deficient number, since it is larger than the sum of its proper divisors (1).

9685135781 is an equidigital number, since it uses as much as digits as its factorization.

9685135781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 53.

The square root of 9685135781 is about 98413.0874477577. The cubic root of 9685135781 is about 2131.5813145903.

The spelling of 9685135781 in words is "nine billion, six hundred eighty-five million, one hundred thirty-five thousand, seven hundred eighty-one".