208404481 has 4 divisors (see below), whose sum is σ = 208433412. Its totient is φ = 208375552.

The previous prime is 208404467. The next prime is 208404491. The reversal of 208404481 is 184404802.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 195552256 + 12852225 = 13984^2 + 3585^2 .

It is a cyclic number.

It is not a de Polignac number, because 208404481 - 2¹¹ = 208402433 is a prime.

It is a super-2 number, since 2×208404481² = 86864855401758722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208404401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5865 + ... + 21241.

It is an arithmetic number, because the mean of its divisors is an integer number (52108353).

It is a Proth number, since it is equal to 795 ⋅ 2¹⁸ + 1 and 795 < 2¹⁸.

Almost surely, 2^208404481 is an apocalyptic number.

It is an amenable number.

208404481 is a deficient number, since it is larger than the sum of its proper divisors (28931).

208404481 is a wasteful number, since it uses less digits than its factorization.

208404481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28930.

The product of its (nonzero) digits is 8192, while the sum is 31.

The square root of 208404481 is about 14436.2211468237. The cubic root of 208404481 is about 592.8830269768.

The spelling of 208404481 in words is "two hundred eight million, four hundred four thousand, four hundred eighty-one".