208828961 has 4 divisors (see below), whose sum is σ = 227813424. Its totient is φ = 189844500.

The previous prime is 208828951. The next prime is 208828987. The reversal of 208828961 is 169828802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 208828961 - 2⁶ = 208828897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (208828951) 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 in 3 ways as a sum of consecutive naturals, for example, 9492215 + ... + 9492236.

It is an arithmetic number, because the mean of its divisors is an integer number (56953356).

Almost surely, 2^208828961 is an apocalyptic number.

It is an amenable number.

208828961 is a deficient number, since it is larger than the sum of its proper divisors (18984463).

208828961 is a wasteful number, since it uses less digits than its factorization.

208828961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18984462.

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 208828961 is about 14450.9155765301. The cubic root of 208828961 is about 593.2852837059.

The spelling of 208828961 in words is "two hundred eight million, eight hundred twenty-eight thousand, nine hundred sixty-one".