209438544941 has 2 divisors, whose sum is σ = 209438544942. Its totient is φ = 209438544940.

The previous prime is 209438544907. The next prime is 209438544961. The reversal of 209438544941 is 149445834902.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205349454025 + 4089090916 = 453155^2 + 63946^2 .

It is a cyclic number.

It is not a de Polignac number, because 209438544941 - 2¹⁰ = 209438543917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209438544961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104719272470 + 104719272471.

It is an arithmetic number, because the mean of its divisors is an integer number (104719272471).

Almost surely, 2^209438544941 is an apocalyptic number.

It is an amenable number.

209438544941 is a deficient number, since it is larger than the sum of its proper divisors (1).

209438544941 is an equidigital number, since it uses as much as digits as its factorization.

209438544941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4976640, while the sum is 53.

The spelling of 209438544941 in words is "two hundred nine billion, four hundred thirty-eight million, five hundred forty-four thousand, nine hundred forty-one".