209839115253 has 4 divisors (see below), whose sum is σ = 279785487008. Its totient is φ = 139892743500.

The previous prime is 209839115197. The next prime is 209839115281. The reversal of 209839115253 is 352511938902.

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 not a de Polignac number, because 209839115253 - 2⁸ = 209839114997 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 (209839115053) 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, 34973185873 + ... + 34973185878.

It is an arithmetic number, because the mean of its divisors is an integer number (69946371752).

Almost surely, 2^209839115253 is an apocalyptic number.

It is an amenable number.

209839115253 is a deficient number, since it is larger than the sum of its proper divisors (69946371755).

209839115253 is an equidigital number, since it uses as much as digits as its factorization.

209839115253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69946371754.

The product of its (nonzero) digits is 583200, while the sum is 48.

The spelling of 209839115253 in words is "two hundred nine billion, eight hundred thirty-nine million, one hundred fifteen thousand, two hundred fifty-three".