194137209 has 16 divisors (see below), whose sum is σ = 328698240. Its totient is φ = 110935440.

The previous prime is 194137201. The next prime is 194137241. The reversal of 194137209 is 902731491.

194137209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 194137209 - 2³ = 194137201 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (194137201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 513402 + ... + 513779.

It is an arithmetic number, because the mean of its divisors is an integer number (20543640).

Almost surely, 2^194137209 is an apocalyptic number.

It is an amenable number.

194137209 is a deficient number, since it is larger than the sum of its proper divisors (134561031).

194137209 is a wasteful number, since it uses less digits than its factorization.

194137209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027197 (or 1027191 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 194137209 is about 13933.3129226326. The cubic root of 194137209 is about 579.0324822712.

The spelling of 194137209 in words is "one hundred ninety-four million, one hundred thirty-seven thousand, two hundred nine".