208820149 has 2 divisors, whose sum is σ = 208820150. Its totient is φ = 208820148.

The previous prime is 208820137. The next prime is 208820153. The reversal of 208820149 is 941028802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115562500 + 93257649 = 10750^2 + 9657^2 .

It is a cyclic number.

It is not a de Polignac number, because 208820149 - 2¹¹ = 208818101 is a prime.

It is a super-3 number, since 3×208820149³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208820179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104410074 + 104410075.

It is an arithmetic number, because the mean of its divisors is an integer number (104410075).

Almost surely, 2^208820149 is an apocalyptic number.

It is an amenable number.

208820149 is a deficient number, since it is larger than the sum of its proper divisors (1).

208820149 is an equidigital number, since it uses as much as digits as its factorization.

208820149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 208820149 is about 14450.6106791374. The cubic root of 208820149 is about 593.2769385935.

The spelling of 208820149 in words is "two hundred eight million, eight hundred twenty thousand, one hundred forty-nine".