208233989 has 2 divisors, whose sum is σ = 208233990. Its totient is φ = 208233988.

The previous prime is 208233953. The next prime is 208233997. The reversal of 208233989 is 989332802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161544100 + 46689889 = 12710^2 + 6833^2 .

It is a cyclic number.

It is not a de Polignac number, because 208233989 - 2²⁰ = 207185413 is a prime.

It is a super-2 number, since 2×208233989² = 86722788349704242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208223989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104116994 + 104116995.

It is an arithmetic number, because the mean of its divisors is an integer number (104116995).

Almost surely, 2^208233989 is an apocalyptic number.

It is an amenable number.

208233989 is a deficient number, since it is larger than the sum of its proper divisors (1).

208233989 is an equidigital number, since it uses as much as digits as its factorization.

208233989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 208233989 is about 14430.3149307283. The cubic root of 208233989 is about 592.7213071816.

The spelling of 208233989 in words is "two hundred eight million, two hundred thirty-three thousand, nine hundred eighty-nine".