209189386253 has 4 divisors (see below), whose sum is σ = 209229018240. Its totient is φ = 209149754268.

The previous prime is 209189386201. The next prime is 209189386271. The reversal of 209189386253 is 352683981902.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 209189386253 - 2²⁶ = 209122277389 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 (209189388253) 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, 19808075 + ... + 19818632.

It is an arithmetic number, because the mean of its divisors is an integer number (52307254560).

Almost surely, 2^209189386253 is an apocalyptic number.

It is an amenable number.

209189386253 is a deficient number, since it is larger than the sum of its proper divisors (39631987).

209189386253 is an equidigital number, since it uses as much as digits as its factorization.

209189386253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39631986.

The product of its (nonzero) digits is 5598720, while the sum is 56.

The spelling of 209189386253 in words is "two hundred nine billion, one hundred eighty-nine million, three hundred eighty-six thousand, two hundred fifty-three".