209131343 has 2 divisors, whose sum is σ = 209131344. Its totient is φ = 209131342.

The previous prime is 209131339. The next prime is 209131361. The reversal of 209131343 is 343131902.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209131343 - 2² = 209131339 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209131313) 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, 104565671 + 104565672.

It is an arithmetic number, because the mean of its divisors is an integer number (104565672).

Almost surely, 2^209131343 is an apocalyptic number.

209131343 is a deficient number, since it is larger than the sum of its proper divisors (1).

209131343 is an equidigital number, since it uses as much as digits as its factorization.

209131343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 209131343 is about 14461.3741739850. The cubic root of 209131343 is about 593.5715024217.

The spelling of 209131343 in words is "two hundred nine million, one hundred thirty-one thousand, three hundred forty-three".