194979217 has 2 divisors, whose sum is σ = 194979218. Its totient is φ = 194979216.

The previous prime is 194979199. The next prime is 194979223. The reversal of 194979217 is 712979491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194909521 + 69696 = 13961^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 194979217 - 2⁷ = 194979089 is a prime.

It is not a weakly prime, because it can be changed into another prime (194979227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97489608 + 97489609.

It is an arithmetic number, because the mean of its divisors is an integer number (97489609).

Almost surely, 2^194979217 is an apocalyptic number.

It is an amenable number.

194979217 is a deficient number, since it is larger than the sum of its proper divisors (1).

194979217 is an equidigital number, since it uses as much as digits as its factorization.

194979217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 285768, while the sum is 49.

The square root of 194979217 is about 13963.4958731687. The cubic root of 194979217 is about 579.8683976089.

The spelling of 194979217 in words is "one hundred ninety-four million, nine hundred seventy-nine thousand, two hundred seventeen".