194940917 has 2 divisors, whose sum is σ = 194940918. Its totient is φ = 194940916.

The previous prime is 194940899. The next prime is 194940919. The reversal of 194940917 is 719049491.

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., 183169156 + 11771761 = 13534^2 + 3431^2 .

It is a cyclic number.

It is not a de Polignac number, because 194940917 - 2²⁰ = 193892341 is a prime.

It is a super-2 number, since 2×194940917² = 76003922241601778, which contains 22 as substring.

Together with 194940919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194940919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97470458 + 97470459.

It is an arithmetic number, because the mean of its divisors is an integer number (97470459).

Almost surely, 2^194940917 is an apocalyptic number.

It is an amenable number.

194940917 is a deficient number, since it is larger than the sum of its proper divisors (1).

194940917 is an equidigital number, since it uses as much as digits as its factorization.

194940917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 194940917 is about 13962.1243727450. The cubic root of 194940917 is about 579.8304270424.

The spelling of 194940917 in words is "one hundred ninety-four million, nine hundred forty thousand, nine hundred seventeen".