209916459061 has 2 divisors, whose sum is σ = 209916459062. Its totient is φ = 209916459060.

The previous prime is 209916458989. The next prime is 209916459161. The reversal of 209916459061 is 160954619902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186783874225 + 23132584836 = 432185^2 + 152094^2 .

It is a cyclic number.

It is not a de Polignac number, because 209916459061 - 2¹³ = 209916450869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209916459161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104958229530 + 104958229531.

It is an arithmetic number, because the mean of its divisors is an integer number (104958229531).

Almost surely, 2^209916459061 is an apocalyptic number.

It is an amenable number.

209916459061 is a deficient number, since it is larger than the sum of its proper divisors (1).

209916459061 is an equidigital number, since it uses as much as digits as its factorization.

209916459061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1049760, while the sum is 52.

The spelling of 209916459061 in words is "two hundred nine billion, nine hundred sixteen million, four hundred fifty-nine thousand, sixty-one".