208156243 has 2 divisors, whose sum is σ = 208156244. Its totient is φ = 208156242.

The previous prime is 208156241. The next prime is 208156261. The reversal of 208156243 is 342651802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 208156243 - 2¹ = 208156241 is a prime.

Together with 208156241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (208156241) 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, 104078121 + 104078122.

It is an arithmetic number, because the mean of its divisors is an integer number (104078122).

Almost surely, 2^208156243 is an apocalyptic number.

208156243 is a deficient number, since it is larger than the sum of its proper divisors (1).

208156243 is an equidigital number, since it uses as much as digits as its factorization.

208156243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 208156243 is about 14427.6208364373. The cubic root of 208156243 is about 592.6475320866.

The spelling of 208156243 in words is "two hundred eight million, one hundred fifty-six thousand, two hundred forty-three".