194469661 has 2 divisors, whose sum is σ = 194469662. Its totient is φ = 194469660.

The previous prime is 194469643. The next prime is 194469713. The reversal of 194469661 is 166964491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194072761 + 396900 = 13931^2 + 630^2 .

It is an emirp because it is prime and its reverse (166964491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194469661 - 2¹⁹ = 193945373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194469061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97234830 + 97234831.

It is an arithmetic number, because the mean of its divisors is an integer number (97234831).

Almost surely, 2^194469661 is an apocalyptic number.

194469661 is the 6237-th centered decagonal number.

It is an amenable number.

194469661 is a deficient number, since it is larger than the sum of its proper divisors (1).

194469661 is an equidigital number, since it uses as much as digits as its factorization.

194469661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 46.

The square root of 194469661 is about 13945.2379327138. The cubic root of 194469661 is about 579.3628168992.

The spelling of 194469661 in words is "one hundred ninety-four million, four hundred sixty-nine thousand, six hundred sixty-one".