209291041 has 2 divisors, whose sum is σ = 209291042. Its totient is φ = 209291040.

The previous prime is 209291039. The next prime is 209291051. The reversal of 209291041 is 140192902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170851041 + 38440000 = 13071^2 + 6200^2 .

It is a cyclic number.

It is not a de Polignac number, because 209291041 - 2¹ = 209291039 is a prime.

Together with 209291039, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (209291051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104645520 + 104645521.

It is an arithmetic number, because the mean of its divisors is an integer number (104645521).

Almost surely, 2^209291041 is an apocalyptic number.

It is an amenable number.

209291041 is a deficient number, since it is larger than the sum of its proper divisors (1).

209291041 is an equidigital number, since it uses as much as digits as its factorization.

209291041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 209291041 is about 14466.8946564216. The cubic root of 209291041 is about 593.7225527331.

The spelling of 209291041 in words is "two hundred nine million, two hundred ninety-one thousand, forty-one".