194936857 has 2 divisors, whose sum is σ = 194936858. Its totient is φ = 194936856.

The previous prime is 194936801. The next prime is 194936867. The reversal of 194936857 is 758639491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 172554496 + 22382361 = 13136^2 + 4731^2 .

It is an emirp because it is prime and its reverse (758639491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194936857 is a prime.

It is not a weakly prime, because it can be changed into another prime (194936867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97468428 + 97468429.

It is an arithmetic number, because the mean of its divisors is an integer number (97468429).

Almost surely, 2^194936857 is an apocalyptic number.

It is an amenable number.

194936857 is a deficient number, since it is larger than the sum of its proper divisors (1).

194936857 is an equidigital number, since it uses as much as digits as its factorization.

194936857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 52.

The square root of 194936857 is about 13961.9789786405. The cubic root of 194936857 is about 579.8264016725.

The spelling of 194936857 in words is "one hundred ninety-four million, nine hundred thirty-six thousand, eight hundred fifty-seven".