209452817813 has 16 divisors (see below), whose sum is σ = 223692637824. Its totient is φ = 195433512960.

The previous prime is 209452817771. The next prime is 209452817831. The reversal of 209452817813 is 318718254902.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209452817813 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 (209452817843) 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, 808256 + ... + 1035462.

It is an arithmetic number, because the mean of its divisors is an integer number (13980789864).

Almost surely, 2^209452817813 is an apocalyptic number.

It is an amenable number.

209452817813 is a deficient number, since it is larger than the sum of its proper divisors (14239820011).

209452817813 is a wasteful number, since it uses less digits than its factorization.

209452817813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227692.

The product of its (nonzero) digits is 967680, while the sum is 50.

The spelling of 209452817813 in words is "two hundred nine billion, four hundred fifty-two million, eight hundred seventeen thousand, eight hundred thirteen".