208999993 has 2 divisors, whose sum is σ = 208999994. Its totient is φ = 208999992.

The previous prime is 208999991. The next prime is 209000017. The reversal of 208999993 is 399999802.

208999993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146700544 + 62299449 = 12112^2 + 7893^2 .

It is a cyclic number.

It is not a de Polignac number, because 208999993 - 2¹ = 208999991 is a prime.

Together with 208999991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (208999991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104499996 + 104499997.

It is an arithmetic number, because the mean of its divisors is an integer number (104499997).

Almost surely, 2^208999993 is an apocalyptic number.

It is an amenable number.

208999993 is a deficient number, since it is larger than the sum of its proper divisors (1).

208999993 is an equidigital number, since it uses as much as digits as its factorization.

208999993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2834352, while the sum is 58.

The square root of 208999993 is about 14456.8320527009. The cubic root of 208999993 is about 593.4472074146.

The spelling of 208999993 in words is "two hundred eight million, nine hundred ninety-nine thousand, nine hundred ninety-three".