209809232641 has 2 divisors, whose sum is σ = 209809232642. Its totient is φ = 209809232640.

The previous prime is 209809232617. The next prime is 209809232657. The reversal of 209809232641 is 146232908902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200439767025 + 9369465616 = 447705^2 + 96796^2 .

It is a cyclic number.

It is not a de Polignac number, because 209809232641 - 2²⁹ = 209272361729 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 209809232591 and 209809232600.

It is not a weakly prime, because it can be changed into another prime (209809232441) 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, 104904616320 + 104904616321.

It is an arithmetic number, because the mean of its divisors is an integer number (104904616321).

Almost surely, 2^209809232641 is an apocalyptic number.

It is an amenable number.

209809232641 is a deficient number, since it is larger than the sum of its proper divisors (1).

209809232641 is an equidigital number, since it uses as much as digits as its factorization.

209809232641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 46.

The spelling of 209809232641 in words is "two hundred nine billion, eight hundred nine million, two hundred thirty-two thousand, six hundred forty-one".