208120897 has 2 divisors, whose sum is σ = 208120898. Its totient is φ = 208120896.

The previous prime is 208120853. The next prime is 208120909. The reversal of 208120897 is 798021802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165662641 + 42458256 = 12871^2 + 6516^2 .

It is a cyclic number.

It is not a de Polignac number, because 208120897 - 2⁷ = 208120769 is a prime.

It is not a weakly prime, because it can be changed into another prime (208120807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104060448 + 104060449.

It is an arithmetic number, because the mean of its divisors is an integer number (104060449).

Almost surely, 2^208120897 is an apocalyptic number.

It is an amenable number.

208120897 is a deficient number, since it is larger than the sum of its proper divisors (1).

208120897 is an equidigital number, since it uses as much as digits as its factorization.

208120897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 208120897 is about 14426.3958423440. The cubic root of 208120897 is about 592.6139853220.

The spelling of 208120897 in words is "two hundred eight million, one hundred twenty thousand, eight hundred ninety-seven".