208971901 has 2 divisors, whose sum is σ = 208971902. Its totient is φ = 208971900.

The previous prime is 208971881. The next prime is 208971949. The reversal of 208971901 is 109179802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140991876 + 67980025 = 11874^2 + 8245^2 .

It is a cyclic number.

It is not a de Polignac number, because 208971901 - 2⁷ = 208971773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208971001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104485950 + 104485951.

It is an arithmetic number, because the mean of its divisors is an integer number (104485951).

Almost surely, 2^208971901 is an apocalyptic number.

It is an amenable number.

208971901 is a deficient number, since it is larger than the sum of its proper divisors (1).

208971901 is an equidigital number, since it uses as much as digits as its factorization.

208971901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 208971901 is about 14455.8604378985. The cubic root of 208971901 is about 593.4206175159.

The spelling of 208971901 in words is "two hundred eight million, nine hundred seventy-one thousand, nine hundred one".