194142281 has 2 divisors, whose sum is σ = 194142282. Its totient is φ = 194142280.

The previous prime is 194142253. The next prime is 194142341. The reversal of 194142281 is 182241491.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104366656 + 89775625 = 10216^2 + 9475^2 .

It is an emirp because it is prime and its reverse (182241491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194142281 is a prime.

It is a super-2 number, since 2×194142281² = 75382450543765922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (194142251) 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, 97071140 + 97071141.

It is an arithmetic number, because the mean of its divisors is an integer number (97071141).

Almost surely, 2^194142281 is an apocalyptic number.

It is an amenable number.

194142281 is a deficient number, since it is larger than the sum of its proper divisors (1).

194142281 is an equidigital number, since it uses as much as digits as its factorization.

194142281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 32.

The square root of 194142281 is about 13933.4949312798. The cubic root of 194142281 is about 579.0375247996.

The spelling of 194142281 in words is "one hundred ninety-four million, one hundred forty-two thousand, two hundred eighty-one".