194049509 has 4 divisors (see below), whose sum is σ = 205464204. Its totient is φ = 182634816.

The previous prime is 194049503. The next prime is 194049521. The reversal of 194049509 is 905940491.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 174821284 + 19228225 = 13222^2 + 4385^2 .

It is a cyclic number.

It is not a de Polignac number, because 194049509 - 2⁸ = 194049253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194049503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5707322 + ... + 5707355.

It is an arithmetic number, because the mean of its divisors is an integer number (51366051).

Almost surely, 2^194049509 is an apocalyptic number.

It is an amenable number.

194049509 is a deficient number, since it is larger than the sum of its proper divisors (11414695).

194049509 is a wasteful number, since it uses less digits than its factorization.

194049509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11414694.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 194049509 is about 13930.1654333321. The cubic root of 194049509 is about 578.9452779729.

The spelling of 194049509 in words is "one hundred ninety-four million, forty-nine thousand, five hundred nine".