194401813 has 2 divisors, whose sum is σ = 194401814. Its totient is φ = 194401812.

The previous prime is 194401807. The next prime is 194401829. The reversal of 194401813 is 318104491.

194401813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174847729 + 19554084 = 13223^2 + 4422^2 .

It is a cyclic number.

It is not a de Polignac number, because 194401813 - 2⁹ = 194401301 is a prime.

It is equal to p_10786126 and since 194401813 and 10786126 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 (194401513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97200906 + 97200907.

It is an arithmetic number, because the mean of its divisors is an integer number (97200907).

Almost surely, 2^194401813 is an apocalyptic number.

It is an amenable number.

194401813 is a deficient number, since it is larger than the sum of its proper divisors (1).

194401813 is an equidigital number, since it uses as much as digits as its factorization.

194401813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 194401813 is about 13942.8050621100. The cubic root of 194401813 is about 579.2954316140.

The spelling of 194401813 in words is "one hundred ninety-four million, four hundred one thousand, eight hundred thirteen".