209750897947 has 2 divisors, whose sum is σ = 209750897948. Its totient is φ = 209750897946.

The previous prime is 209750897897. The next prime is 209750897959. The reversal of 209750897947 is 749798057902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209750897947 - 2¹¹ = 209750895899 is a prime.

It is not a weakly prime, because it can be changed into another prime (209750897047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104875448973 + 104875448974.

It is an arithmetic number, because the mean of its divisors is an integer number (104875448974).

Almost surely, 2^209750897947 is an apocalyptic number.

209750897947 is a deficient number, since it is larger than the sum of its proper divisors (1).

209750897947 is an equidigital number, since it uses as much as digits as its factorization.

209750897947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80015040, while the sum is 67.

The spelling of 209750897947 in words is "two hundred nine billion, seven hundred fifty million, eight hundred ninety-seven thousand, nine hundred forty-seven".