209534940149 has 2 divisors, whose sum is σ = 209534940150. Its totient is φ = 209534940148.

The previous prime is 209534940089. The next prime is 209534940157. The reversal of 209534940149 is 941049435902.

209534940149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119720844049 + 89814096100 = 346007^2 + 299690^2 .

It is a cyclic number.

It is not a de Polignac number, because 209534940149 - 2²⁰ = 209533891573 is a prime.

It is a super-2 number, since 2×209534940149² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 209534940097 and 209534940106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209534940169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104767470074 + 104767470075.

It is an arithmetic number, because the mean of its divisors is an integer number (104767470075).

Almost surely, 2^209534940149 is an apocalyptic number.

It is an amenable number.

209534940149 is a deficient number, since it is larger than the sum of its proper divisors (1).

209534940149 is an equidigital number, since it uses as much as digits as its factorization.

209534940149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 209534940149 in words is "two hundred nine billion, five hundred thirty-four million, nine hundred forty thousand, one hundred forty-nine".