194130009 has 12 divisors (see below), whose sum is σ = 287989156. Its totient is φ = 125921952.

The previous prime is 194129989. The next prime is 194130023. The reversal of 194130009 is 900031491.

It can be written as a sum of positive squares in 2 ways, for example, as 168272784 + 25857225 = 12972^2 + 5085^2 .

It is not a de Polignac number, because 194130009 - 2¹⁹ = 193605721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194132009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 291154 + ... + 291819.

Almost surely, 2^194130009 is an apocalyptic number.

It is an amenable number.

194130009 is a deficient number, since it is larger than the sum of its proper divisors (93859147).

194130009 is a wasteful number, since it uses less digits than its factorization.

194130009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583016 (or 583013 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 194130009 is about 13933.0545466527. The cubic root of 194130009 is about 579.0253239570.

The spelling of 194130009 in words is "one hundred ninety-four million, one hundred thirty thousand, nine".