208056521 has 2 divisors, whose sum is σ = 208056522. Its totient is φ = 208056520.

The previous prime is 208056503. The next prime is 208056539. The reversal of 208056521 is 125650802.

It is a balanced prime because it is at equal distance from previous prime (208056503) and next prime (208056539).

It can be written as a sum of positive squares in only one way, i.e., 143736121 + 64320400 = 11989^2 + 8020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208056521 is a prime.

It is not a weakly prime, because it can be changed into another prime (208056581) 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 as a sum of consecutive naturals, namely, 104028260 + 104028261.

It is an arithmetic number, because the mean of its divisors is an integer number (104028261).

Almost surely, 2^208056521 is an apocalyptic number.

It is an amenable number.

208056521 is a deficient number, since it is larger than the sum of its proper divisors (1).

208056521 is an equidigital number, since it uses as much as digits as its factorization.

208056521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 208056521 is about 14424.1644818686. The cubic root of 208056521 is about 592.5528765263.

The spelling of 208056521 in words is "two hundred eight million, fifty-six thousand, five hundred twenty-one".