193809698861 has 2 divisors, whose sum is σ = 193809698862. Its totient is φ = 193809698860.

The previous prime is 193809698851. The next prime is 193809698893. The reversal of 193809698861 is 168896908391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98529443236 + 95280255625 = 313894^2 + 308675^2 .

It is an emirp because it is prime and its reverse (168896908391) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193809698861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 193809698791 and 193809698800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (193809698851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96904849430 + 96904849431.

It is an arithmetic number, because the mean of its divisors is an integer number (96904849431).

Almost surely, 2^193809698861 is an apocalyptic number.

It is an amenable number.

193809698861 is a deficient number, since it is larger than the sum of its proper divisors (1).

193809698861 is an equidigital number, since it uses as much as digits as its factorization.

193809698861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40310784, while the sum is 68.

The spelling of 193809698861 in words is "one hundred ninety-three billion, eight hundred nine million, six hundred ninety-eight thousand, eight hundred sixty-one".