209419406924687 has 2 divisors, whose sum is σ = 209419406924688. Its totient is φ = 209419406924686.

The previous prime is 209419406924501. The next prime is 209419406924771. The reversal of 209419406924687 is 786429604914902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209419406924687 - 2²⁶ = 209419339815823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209419406924687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209419406921687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104709703462343 + 104709703462344.

It is an arithmetic number, because the mean of its divisors is an integer number (104709703462344).

Almost surely, 2^{209419406924687} is an apocalyptic number.

209419406924687 is a deficient number, since it is larger than the sum of its proper divisors (1).

209419406924687 is an equidigital number, since it uses as much as digits as its factorization.

209419406924687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 376233984, while the sum is 71.

The spelling of 209419406924687 in words is "two hundred nine trillion, four hundred nineteen billion, four hundred six million, nine hundred twenty-four thousand, six hundred eighty-seven".