209191710139 has 2 divisors, whose sum is σ = 209191710140. Its totient is φ = 209191710138.

The previous prime is 209191710127. The next prime is 209191710229. The reversal of 209191710139 is 931017191902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209191710139 - 2⁵ = 209191710107 is a prime.

It is a super-2 number, since 2×209191710139² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 209191710095 and 209191710104.

It is not a weakly prime, because it can be changed into another prime (209191711139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104595855069 + 104595855070.

It is an arithmetic number, because the mean of its divisors is an integer number (104595855070).

Almost surely, 2^209191710139 is an apocalyptic number.

209191710139 is a deficient number, since it is larger than the sum of its proper divisors (1).

209191710139 is an equidigital number, since it uses as much as digits as its factorization.

209191710139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 43.

The spelling of 209191710139 in words is "two hundred nine billion, one hundred ninety-one million, seven hundred ten thousand, one hundred thirty-nine".