194969081 has 2 divisors, whose sum is σ = 194969082. Its totient is φ = 194969080.

The previous prime is 194969069. The next prime is 194969083. The reversal of 194969081 is 180969491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176650681 + 18318400 = 13291^2 + 4280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194969081 is a prime.

It is a super-2 number, since 2×194969081² = 76025885091969122, which contains 22 as substring.

Together with 194969083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (194969083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97484540 + 97484541.

It is an arithmetic number, because the mean of its divisors is an integer number (97484541).

Almost surely, 2^194969081 is an apocalyptic number.

It is an amenable number.

194969081 is a deficient number, since it is larger than the sum of its proper divisors (1).

194969081 is an equidigital number, since it uses as much as digits as its factorization.

194969081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 47.

The square root of 194969081 is about 13963.1329220917. The cubic root of 194969081 is about 579.8583492765.

The spelling of 194969081 in words is "one hundred ninety-four million, nine hundred sixty-nine thousand, eighty-one".