194888609 has 2 divisors, whose sum is σ = 194888610. Its totient is φ = 194888608.

The previous prime is 194888587. The next prime is 194888627. The reversal of 194888609 is 906888491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192238225 + 2650384 = 13865^2 + 1628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194888609 is a prime.

It is not a weakly prime, because it can be changed into another prime (194888209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97444304 + 97444305.

It is an arithmetic number, because the mean of its divisors is an integer number (97444305).

Almost surely, 2^194888609 is an apocalyptic number.

It is an amenable number.

194888609 is a deficient number, since it is larger than the sum of its proper divisors (1).

194888609 is an equidigital number, since it uses as much as digits as its factorization.

194888609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 995328, while the sum is 53.

The square root of 194888609 is about 13960.2510364248. The cubic root of 194888609 is about 579.7785609290.

The spelling of 194888609 in words is "one hundred ninety-four million, eight hundred eighty-eight thousand, six hundred nine".