208140073 has 2 divisors, whose sum is σ = 208140074. Its totient is φ = 208140072.

The previous prime is 208140043. The next prime is 208140077. The reversal of 208140073 is 370041802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168298729 + 39841344 = 12973^2 + 6312^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208140073 is a prime.

It is not a weakly prime, because it can be changed into another prime (208140077) 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, 104070036 + 104070037.

It is an arithmetic number, because the mean of its divisors is an integer number (104070037).

Almost surely, 2^208140073 is an apocalyptic number.

It is an amenable number.

208140073 is a deficient number, since it is larger than the sum of its proper divisors (1).

208140073 is an equidigital number, since it uses as much as digits as its factorization.

208140073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 208140073 is about 14427.0604420998. The cubic root of 208140073 is about 592.6321856676.

Adding to 208140073 its reverse (370041802), we get a palindrome (578181875).

The spelling of 208140073 in words is "two hundred eight million, one hundred forty thousand, seventy-three".