194426809 has 2 divisors, whose sum is σ = 194426810. Its totient is φ = 194426808.

The previous prime is 194426803. The next prime is 194426833. The reversal of 194426809 is 908624491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133633600 + 60793209 = 11560^2 + 7797^2 .

It is a cyclic number.

It is not a de Polignac number, because 194426809 - 2⁵ = 194426777 is a prime.

It is not a weakly prime, because it can be changed into another prime (194426803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97213404 + 97213405.

It is an arithmetic number, because the mean of its divisors is an integer number (97213405).

Almost surely, 2^194426809 is an apocalyptic number.

It is an amenable number.

194426809 is a deficient number, since it is larger than the sum of its proper divisors (1).

194426809 is an equidigital number, since it uses as much as digits as its factorization.

194426809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 194426809 is about 13943.7014095971. The cubic root of 194426809 is about 579.3202589683.

The spelling of 194426809 in words is "one hundred ninety-four million, four hundred twenty-six thousand, eight hundred nine".