209684130311 has 2 divisors, whose sum is σ = 209684130312. Its totient is φ = 209684130310.

The previous prime is 209684130307. The next prime is 209684130343. The reversal of 209684130311 is 113031486902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209684130311 - 2² = 209684130307 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209684130371) 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 as a sum of consecutive naturals, namely, 104842065155 + 104842065156.

It is an arithmetic number, because the mean of its divisors is an integer number (104842065156).

Almost surely, 2^209684130311 is an apocalyptic number.

209684130311 is a deficient number, since it is larger than the sum of its proper divisors (1).

209684130311 is an equidigital number, since it uses as much as digits as its factorization.

209684130311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 38.

The spelling of 209684130311 in words is "two hundred nine billion, six hundred eighty-four million, one hundred thirty thousand, three hundred eleven".