194460809 has 2 divisors, whose sum is σ = 194460810. Its totient is φ = 194460808.

The previous prime is 194460787. The next prime is 194460821. The reversal of 194460809 is 908064491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154455184 + 40005625 = 12428^2 + 6325^2 .

It is an emirp because it is prime and its reverse (908064491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 194460809 - 2²⁴ = 177683593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (194460829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97230404 + 97230405.

It is an arithmetic number, because the mean of its divisors is an integer number (97230405).

Almost surely, 2^194460809 is an apocalyptic number.

It is an amenable number.

194460809 is a deficient number, since it is larger than the sum of its proper divisors (1).

194460809 is an equidigital number, since it uses as much as digits as its factorization.

194460809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 194460809 is about 13944.9205447718. The cubic root of 194460809 is about 579.3540261579.

The spelling of 194460809 in words is "one hundred ninety-four million, four hundred sixty thousand, eight hundred nine".