194081281 has 2 divisors, whose sum is σ = 194081282. Its totient is φ = 194081280.

The previous prime is 194081233. The next prime is 194081323. The reversal of 194081281 is 182180491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147841281 + 46240000 = 12159^2 + 6800^2 .

It is a cyclic number.

It is not a de Polignac number, because 194081281 - 2⁹ = 194080769 is a prime.

It is a super-2 number, since 2×194081281² = 75335087269201922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (194081581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97040640 + 97040641.

It is an arithmetic number, because the mean of its divisors is an integer number (97040641).

Almost surely, 2^194081281 is an apocalyptic number.

It is an amenable number.

194081281 is a deficient number, since it is larger than the sum of its proper divisors (1).

194081281 is an equidigital number, since it uses as much as digits as its factorization.

194081281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 194081281 is about 13931.3057894800. The cubic root of 194081281 is about 578.9768734244.

The spelling of 194081281 in words is "one hundred ninety-four million, eighty-one thousand, two hundred eighty-one".