194630081 has 2 divisors, whose sum is σ = 194630082. Its totient is φ = 194630080.

The previous prime is 194630063. The next prime is 194630087. The reversal of 194630081 is 180036491.

It is a happy number.

194630081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103713856 + 90916225 = 10184^2 + 9535^2 .

It is an emirp because it is prime and its reverse (180036491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194630081 - 2¹⁸ = 194367937 is a prime.

It is a super-2 number, since 2×194630081² = 75761736860133122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (194630087) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97315040 + 97315041.

It is an arithmetic number, because the mean of its divisors is an integer number (97315041).

Almost surely, 2^194630081 is an apocalyptic number.

It is an amenable number.

194630081 is a deficient number, since it is larger than the sum of its proper divisors (1).

194630081 is an equidigital number, since it uses as much as digits as its factorization.

194630081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 194630081 is about 13950.9885312834. The cubic root of 194630081 is about 579.5220805400.

The spelling of 194630081 in words is "one hundred ninety-four million, six hundred thirty thousand, eighty-one".