194546981 has 2 divisors, whose sum is σ = 194546982. Its totient is φ = 194546980.

The previous prime is 194546951. The next prime is 194547037. The reversal of 194546981 is 189645491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194156356 + 390625 = 13934^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 194546981 - 2²² = 190352677 is a prime.

It is a super-2 number, since 2×194546981² = 75697055632428722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194546951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97273490 + 97273491.

It is an arithmetic number, because the mean of its divisors is an integer number (97273491).

Almost surely, 2^194546981 is an apocalyptic number.

It is an amenable number.

194546981 is a deficient number, since it is larger than the sum of its proper divisors (1).

194546981 is an equidigital number, since it uses as much as digits as its factorization.

194546981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 47.

The square root of 194546981 is about 13948.0099297355. The cubic root of 194546981 is about 579.4395904812.

The spelling of 194546981 in words is "one hundred ninety-four million, five hundred forty-six thousand, nine hundred eighty-one".