194851691317 has 2 divisors, whose sum is σ = 194851691318. Its totient is φ = 194851691316.

The previous prime is 194851691257. The next prime is 194851691327. The reversal of 194851691317 is 713196158491.

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., 169146303076 + 25705388241 = 411274^2 + 160329^2 .

It is a cyclic number.

It is not a de Polignac number, because 194851691317 - 2¹¹ = 194851689269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194851691327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97425845658 + 97425845659.

It is an arithmetic number, because the mean of its divisors is an integer number (97425845659).

Almost surely, 2^194851691317 is an apocalyptic number.

It is an amenable number.

194851691317 is a deficient number, since it is larger than the sum of its proper divisors (1).

194851691317 is an equidigital number, since it uses as much as digits as its factorization.

194851691317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 55.

The spelling of 194851691317 in words is "one hundred ninety-four billion, eight hundred fifty-one million, six hundred ninety-one thousand, three hundred seventeen".