208055681 has 4 divisors (see below), whose sum is σ = 219006000. Its totient is φ = 197105364.

The previous prime is 208055671. The next prime is 208055711. The reversal of 208055681 is 186550802.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-208055681 is a prime.

It is a super-2 number, since 2×208055681² = 86574332792747522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208055611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5475131 + ... + 5475168.

It is an arithmetic number, because the mean of its divisors is an integer number (54751500).

Almost surely, 2^208055681 is an apocalyptic number.

It is an amenable number.

208055681 is a deficient number, since it is larger than the sum of its proper divisors (10950319).

208055681 is a wasteful number, since it uses less digits than its factorization.

208055681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10950318.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 208055681 is about 14424.1353640348. The cubic root of 208055681 is about 592.5520790746.

The spelling of 208055681 in words is "two hundred eight million, fifty-five thousand, six hundred eighty-one".