194759797 has 2 divisors, whose sum is σ = 194759798. Its totient is φ = 194759796.

The previous prime is 194759729. The next prime is 194759813. The reversal of 194759797 is 797957491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162792081 + 31967716 = 12759^2 + 5654^2 .

It is an emirp because it is prime and its reverse (797957491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194759797 - 2²³ = 186371189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194759197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97379898 + 97379899.

It is an arithmetic number, because the mean of its divisors is an integer number (97379899).

Almost surely, 2^194759797 is an apocalyptic number.

It is an amenable number.

194759797 is a deficient number, since it is larger than the sum of its proper divisors (1).

194759797 is an equidigital number, since it uses as much as digits as its factorization.

194759797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5000940, while the sum is 58.

The square root of 194759797 is about 13955.6367464906. The cubic root of 194759797 is about 579.6507975256.

The spelling of 194759797 in words is "one hundred ninety-four million, seven hundred fifty-nine thousand, seven hundred ninety-seven".