208385491 has 2 divisors, whose sum is σ = 208385492. Its totient is φ = 208385490.

The previous prime is 208385479. The next prime is 208385501. The reversal of 208385491 is 194583802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 208385491 - 2⁷ = 208385363 is a prime.

It is a super-2 number, since 2×208385491² = 86849025718622162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (208385461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104192745 + 104192746.

It is an arithmetic number, because the mean of its divisors is an integer number (104192746).

Almost surely, 2^208385491 is an apocalyptic number.

208385491 is a deficient number, since it is larger than the sum of its proper divisors (1).

208385491 is an equidigital number, since it uses as much as digits as its factorization.

208385491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 208385491 is about 14435.5634112424. The cubic root of 208385491 is about 592.8650184218.

The spelling of 208385491 in words is "two hundred eight million, three hundred eighty-five thousand, four hundred ninety-one".