209453079247 has 4 divisors (see below), whose sum is σ = 211374667240. Its totient is φ = 207531491256.

The previous prime is 209453079193. The next prime is 209453079287. The reversal of 209453079247 is 742970354902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209453079247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209453079194 and 209453079203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209453079287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960793833 + ... + 960794050.

It is an arithmetic number, because the mean of its divisors is an integer number (52843666810).

Almost surely, 2^209453079247 is an apocalyptic number.

209453079247 is a deficient number, since it is larger than the sum of its proper divisors (1921587993).

209453079247 is a wasteful number, since it uses less digits than its factorization.

209453079247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921587992.

The product of its (nonzero) digits is 3810240, while the sum is 52.

The spelling of 209453079247 in words is "two hundred nine billion, four hundred fifty-three million, seventy-nine thousand, two hundred forty-seven".