194992517 has 2 divisors, whose sum is σ = 194992518. Its totient is φ = 194992516.

The previous prime is 194992513. The next prime is 194992547. The reversal of 194992517 is 715299491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130896481 + 64096036 = 11441^2 + 8006^2 .

It is an emirp because it is prime and its reverse (715299491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194992517 - 2² = 194992513 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194992513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97496258 + 97496259.

It is an arithmetic number, because the mean of its divisors is an integer number (97496259).

Almost surely, 2^194992517 is an apocalyptic number.

It is an amenable number.

194992517 is a deficient number, since it is larger than the sum of its proper divisors (1).

194992517 is an equidigital number, since it uses as much as digits as its factorization.

194992517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 47.

The square root of 194992517 is about 13963.9721068183. The cubic root of 194992517 is about 579.8815820471.

The spelling of 194992517 in words is "one hundred ninety-four million, nine hundred ninety-two thousand, five hundred seventeen".