208090561 has 8 divisors (see below), whose sum is σ = 242305344. Its totient is φ = 174997680.

The previous prime is 208090559. The next prime is 208090577. The reversal of 208090561 is 165090802.

208090561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 208090561 - 2¹ = 208090559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208090541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 280075 + ... + 280816.

It is an arithmetic number, because the mean of its divisors is an integer number (30288168).

Almost surely, 2^208090561 is an apocalyptic number.

It is an amenable number.

208090561 is a deficient number, since it is larger than the sum of its proper divisors (34214783).

208090561 is an equidigital number, since it uses as much as digits as its factorization.

208090561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560951.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 208090561 is about 14425.3443979685. The cubic root of 208090561 is about 592.5851905018.

The spelling of 208090561 in words is "two hundred eight million, ninety thousand, five hundred sixty-one".