208554961 has 4 divisors (see below), whose sum is σ = 217622592. Its totient is φ = 199487332.

The previous prime is 208554943. The next prime is 208554967. The reversal of 208554961 is 169455802.

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 208554961 - 2⁷ = 208554833 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208554967) 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, 4533781 + ... + 4533826.

It is an arithmetic number, because the mean of its divisors is an integer number (54405648).

Almost surely, 2^208554961 is an apocalyptic number.

It is an amenable number.

208554961 is a deficient number, since it is larger than the sum of its proper divisors (9067631).

208554961 is an equidigital number, since it uses as much as digits as its factorization.

208554961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9067630.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 208554961 is about 14441.4320965755. The cubic root of 208554961 is about 593.0256911729.

The spelling of 208554961 in words is "two hundred eight million, five hundred fifty-four thousand, nine hundred sixty-one".