193835813 has 2 divisors, whose sum is σ = 193835814. Its totient is φ = 193835812.

The previous prime is 193835773. The next prime is 193835843. The reversal of 193835813 is 318538391.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137780644 + 56055169 = 11738^2 + 7487^2 .

It is an emirp because it is prime and its reverse (318538391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 193835813 - 2⁶ = 193835749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (193835843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96917906 + 96917907.

It is an arithmetic number, because the mean of its divisors is an integer number (96917907).

Almost surely, 2^193835813 is an apocalyptic number.

It is an amenable number.

193835813 is a deficient number, since it is larger than the sum of its proper divisors (1).

193835813 is an equidigital number, since it uses as much as digits as its factorization.

193835813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 41.

The square root of 193835813 is about 13922.4930597936. The cubic root of 193835813 is about 578.7326797666.

The spelling of 193835813 in words is "one hundred ninety-three million, eight hundred thirty-five thousand, eight hundred thirteen".