208733989 has 2 divisors, whose sum is σ = 208733990. Its totient is φ = 208733988.

The previous prime is 208733977. The next prime is 208733999. The reversal of 208733989 is 989337802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208311489 + 422500 = 14433^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 208733989 - 2⁹ = 208733477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208733969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104366994 + 104366995.

It is an arithmetic number, because the mean of its divisors is an integer number (104366995).

Almost surely, 2^208733989 is an apocalyptic number.

It is an amenable number.

208733989 is a deficient number, since it is larger than the sum of its proper divisors (1).

208733989 is an equidigital number, since it uses as much as digits as its factorization.

208733989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 208733989 is about 14447.6291826722. The cubic root of 208733989 is about 593.1953312499.

The spelling of 208733989 in words is "two hundred eight million, seven hundred thirty-three thousand, nine hundred eighty-nine".