208656961 has 4 divisors (see below), whose sum is σ = 211771312. Its totient is φ = 205542612.

The previous prime is 208656953. The next prime is 208656967. The reversal of 208656961 is 169656802.

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 208656961 - 2³ = 208656953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208656967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1557075 + ... + 1557208.

It is an arithmetic number, because the mean of its divisors is an integer number (52942828).

Almost surely, 2^208656961 is an apocalyptic number.

It is an amenable number.

208656961 is a deficient number, since it is larger than the sum of its proper divisors (3114351).

208656961 is an equidigital number, since it uses as much as digits as its factorization.

208656961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3114350.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 208656961 is about 14444.9631706003. The cubic root of 208656961 is about 593.1223543604.

The spelling of 208656961 in words is "two hundred eight million, six hundred fifty-six thousand, nine hundred sixty-one".