209129443 has 2 divisors, whose sum is σ = 209129444. Its totient is φ = 209129442.

The previous prime is 209129429. The next prime is 209129483. The reversal of 209129443 is 344921902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209129443 - 2²⁵ = 175575011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 209129399 and 209129408.

It is not a weakly prime, because it can be changed into another prime (209129483) 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, 104564721 + 104564722.

It is an arithmetic number, because the mean of its divisors is an integer number (104564722).

Almost surely, 2^209129443 is an apocalyptic number.

209129443 is a deficient number, since it is larger than the sum of its proper divisors (1).

209129443 is an equidigital number, since it uses as much as digits as its factorization.

209129443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 209129443 is about 14461.3084816001. The cubic root of 209129443 is about 593.5697048444.

The spelling of 209129443 in words is "two hundred nine million, one hundred twenty-nine thousand, four hundred forty-three".