194168813 has 2 divisors, whose sum is σ = 194168814. Its totient is φ = 194168812.

The previous prime is 194168803. The next prime is 194168837. The reversal of 194168813 is 318861491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142515844 + 51652969 = 11938^2 + 7187^2 .

It is a cyclic number.

It is not a de Polignac number, because 194168813 - 2¹⁴ = 194152429 is a prime.

It is equal to p_10773896 and since 194168813 and 10773896 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194168803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97084406 + 97084407.

It is an arithmetic number, because the mean of its divisors is an integer number (97084407).

Almost surely, 2^194168813 is an apocalyptic number.

It is an amenable number.

194168813 is a deficient number, since it is larger than the sum of its proper divisors (1).

194168813 is an equidigital number, since it uses as much as digits as its factorization.

194168813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 41.

The square root of 194168813 is about 13934.4469929739. The cubic root of 194168813 is about 579.0639012004.

The spelling of 194168813 in words is "one hundred ninety-four million, one hundred sixty-eight thousand, eight hundred thirteen".