208311923 has 2 divisors, whose sum is σ = 208311924. Its totient is φ = 208311922.

The previous prime is 208311893. The next prime is 208312001. The reversal of 208311923 is 329113802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 208311923 - 2¹⁰ = 208310899 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (208371923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104155961 + 104155962.

It is an arithmetic number, because the mean of its divisors is an integer number (104155962).

Almost surely, 2^208311923 is an apocalyptic number.

208311923 is a deficient number, since it is larger than the sum of its proper divisors (1).

208311923 is an equidigital number, since it uses as much as digits as its factorization.

208311923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 208311923 is about 14433.0150349814. The cubic root of 208311923 is about 592.7952422470.

The spelling of 208311923 in words is "two hundred eight million, three hundred eleven thousand, nine hundred twenty-three".