194800181 has 2 divisors, whose sum is σ = 194800182. Its totient is φ = 194800180.

The previous prime is 194800169. The next prime is 194800213. The reversal of 194800181 is 181008491.

It is an a-pointer prime, because the next prime (194800213) can be obtained adding 194800181 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145323025 + 49477156 = 12055^2 + 7034^2 .

It is an emirp because it is prime and its reverse (181008491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194800181 is a prime.

It is a super-2 number, since 2×194800181² = 75894221035265522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194800121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97400090 + 97400091.

It is an arithmetic number, because the mean of its divisors is an integer number (97400091).

Almost surely, 2^194800181 is an apocalyptic number.

It is an amenable number.

194800181 is a deficient number, since it is larger than the sum of its proper divisors (1).

194800181 is an equidigital number, since it uses as much as digits as its factorization.

194800181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 194800181 is about 13957.0835420585. The cubic root of 194800181 is about 579.6908588395.

The spelling of 194800181 in words is "one hundred ninety-four million, eight hundred thousand, one hundred eighty-one".