209043929 has 2 divisors, whose sum is σ = 209043930. Its totient is φ = 209043928.

The previous prime is 209043911. The next prime is 209043931. The reversal of 209043929 is 929340902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207216025 + 1827904 = 14395^2 + 1352^2 .

It is a cyclic number.

It is not a de Polignac number, because 209043929 - 2²⁰ = 207995353 is a prime.

Together with 209043931, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 209043892 and 209043901.

It is not a weakly prime, because it can be changed into another prime (209043829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104521964 + 104521965.

It is an arithmetic number, because the mean of its divisors is an integer number (104521965).

Almost surely, 2^209043929 is an apocalyptic number.

It is an amenable number.

209043929 is a deficient number, since it is larger than the sum of its proper divisors (1).

209043929 is an equidigital number, since it uses as much as digits as its factorization.

209043929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 209043929 is about 14458.3515312085. The cubic root of 209043929 is about 593.4887893452.

The spelling of 209043929 in words is "two hundred nine million, forty-three thousand, nine hundred twenty-nine".