209194667147 has 4 divisors (see below), whose sum is σ = 209213992416. Its totient is φ = 209175341880.

The previous prime is 209194667131. The next prime is 209194667183. The reversal of 209194667147 is 741766491902.

209194667147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 209194667147 - 2⁴ = 209194667131 is a prime.

It is a super-2 number, since 2×209194667147² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209194667092 and 209194667101.

It is not an unprimeable number, because it can be changed into a prime (209194667047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9646388 + ... + 9668049.

It is an arithmetic number, because the mean of its divisors is an integer number (52303498104).

Almost surely, 2^209194667147 is an apocalyptic number.

209194667147 is a deficient number, since it is larger than the sum of its proper divisors (19325269).

209194667147 is a wasteful number, since it uses less digits than its factorization.

209194667147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19325268.

The product of its (nonzero) digits is 4572288, while the sum is 56.

The spelling of 209194667147 in words is "two hundred nine billion, one hundred ninety-four million, six hundred sixty-seven thousand, one hundred forty-seven".