194209913 has 2 divisors, whose sum is σ = 194209914. Its totient is φ = 194209912.

The previous prime is 194209901. The next prime is 194209937. The reversal of 194209913 is 319902491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113784889 + 80425024 = 10667^2 + 8968^2 .

It is an emirp because it is prime and its reverse (319902491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194209913 - 2¹⁸ = 193947769 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (194209943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97104956 + 97104957.

It is an arithmetic number, because the mean of its divisors is an integer number (97104957).

Almost surely, 2^194209913 is an apocalyptic number.

It is an amenable number.

194209913 is a deficient number, since it is larger than the sum of its proper divisors (1).

194209913 is an equidigital number, since it uses as much as digits as its factorization.

194209913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 194209913 is about 13935.9216774493. The cubic root of 194209913 is about 579.1047554223.

The spelling of 194209913 in words is "one hundred ninety-four million, two hundred nine thousand, nine hundred thirteen".