194209901 has 2 divisors, whose sum is σ = 194209902. Its totient is φ = 194209900.

The previous prime is 194209891. The next prime is 194209913. The reversal of 194209901 is 109902491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132273001 + 61936900 = 11501^2 + 7870^2 .

It is an emirp because it is prime and its reverse (109902491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194209901 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194209501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97104950 + 97104951.

It is an arithmetic number, because the mean of its divisors is an integer number (97104951).

Almost surely, 2^194209901 is an apocalyptic number.

It is an amenable number.

194209901 is a deficient number, since it is larger than the sum of its proper divisors (1).

194209901 is an equidigital number, since it uses as much as digits as its factorization.

194209901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 194209901 is about 13935.9212469072. The cubic root of 194209901 is about 579.1047434949.

The spelling of 194209901 in words is "one hundred ninety-four million, two hundred nine thousand, nine hundred one".