208474561 has 2 divisors, whose sum is σ = 208474562. Its totient is φ = 208474560.

The previous prime is 208474559. The next prime is 208474571. The reversal of 208474561 is 165474802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113529025 + 94945536 = 10655^2 + 9744^2 .

It is a cyclic number.

It is not a de Polignac number, because 208474561 - 2¹ = 208474559 is a prime.

Together with 208474559, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 208474561.

It is not a weakly prime, because it can be changed into another prime (208474571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104237280 + 104237281.

It is an arithmetic number, because the mean of its divisors is an integer number (104237281).

Almost surely, 2^208474561 is an apocalyptic number.

It is an amenable number.

208474561 is a deficient number, since it is larger than the sum of its proper divisors (1).

208474561 is an equidigital number, since it uses as much as digits as its factorization.

208474561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 208474561 is about 14438.6481707949. The cubic root of 208474561 is about 592.9494756219.

The spelling of 208474561 in words is "two hundred eight million, four hundred seventy-four thousand, five hundred sixty-one".