209690105539 has 2 divisors, whose sum is σ = 209690105540. Its totient is φ = 209690105538.

The previous prime is 209690105509. The next prime is 209690105551. The reversal of 209690105539 is 935501096902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209690105539 - 2²⁵ = 209656551107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 209690105492 and 209690105501.

It is not a weakly prime, because it can be changed into another prime (209690105509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104845052769 + 104845052770.

It is an arithmetic number, because the mean of its divisors is an integer number (104845052770).

Almost surely, 2^209690105539 is an apocalyptic number.

209690105539 is a deficient number, since it is larger than the sum of its proper divisors (1).

209690105539 is an equidigital number, since it uses as much as digits as its factorization.

209690105539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 656100, while the sum is 49.

The spelling of 209690105539 in words is "two hundred nine billion, six hundred ninety million, one hundred five thousand, five hundred thirty-nine".