209714653209 has 4 divisors (see below), whose sum is σ = 279619537616. Its totient is φ = 139809768804.

The previous prime is 209714653193. The next prime is 209714653249. The reversal of 209714653209 is 902356417902.

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 209714653209 - 2⁴ = 209714653193 is a prime.

It is a super-2 number, since 2×209714653209² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209714653249) 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, 34952442199 + ... + 34952442204.

It is an arithmetic number, because the mean of its divisors is an integer number (69904884404).

Almost surely, 2^209714653209 is an apocalyptic number.

It is an amenable number.

209714653209 is a deficient number, since it is larger than the sum of its proper divisors (69904884407).

209714653209 is an equidigital number, since it uses as much as digits as its factorization.

209714653209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69904884406.

The product of its (nonzero) digits is 816480, while the sum is 48.

The spelling of 209714653209 in words is "two hundred nine billion, seven hundred fourteen million, six hundred fifty-three thousand, two hundred nine".