194686213 has 2 divisors, whose sum is σ = 194686214. Its totient is φ = 194686212.

The previous prime is 194686157. The next prime is 194686223. The reversal of 194686213 is 312686491.

194686213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194686209 + 4 = 13953^2 + 2^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194686213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194686223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97343106 + 97343107.

It is an arithmetic number, because the mean of its divisors is an integer number (97343107).

Almost surely, 2^194686213 is an apocalyptic number.

It is an amenable number.

194686213 is a deficient number, since it is larger than the sum of its proper divisors (1).

194686213 is an equidigital number, since it uses as much as digits as its factorization.

194686213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 194686213 is about 13953.0001433383. Note that the first 3 decimals coincide. The cubic root of 194686213 is about 579.5777872539.

The spelling of 194686213 in words is "one hundred ninety-four million, six hundred eighty-six thousand, two hundred thirteen".