208164139 has 2 divisors, whose sum is σ = 208164140. Its totient is φ = 208164138.

The previous prime is 208164097. The next prime is 208164157. The reversal of 208164139 is 931461802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 208164139 - 2¹³ = 208155947 is a prime.

It is a super-3 number, since 3×208164139³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (208164179) 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, 104082069 + 104082070.

It is an arithmetic number, because the mean of its divisors is an integer number (104082070).

Almost surely, 2^208164139 is an apocalyptic number.

208164139 is a deficient number, since it is larger than the sum of its proper divisors (1).

208164139 is an equidigital number, since it uses as much as digits as its factorization.

208164139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 208164139 is about 14427.8944756330. The cubic root of 208164139 is about 592.6550256336.

The spelling of 208164139 in words is "two hundred eight million, one hundred sixty-four thousand, one hundred thirty-nine".