209631241 has 2 divisors, whose sum is σ = 209631242. Its totient is φ = 209631240.

The previous prime is 209631239. The next prime is 209631281. The reversal of 209631241 is 142136902.

209631241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112805641 + 96825600 = 10621^2 + 9840^2 .

It is a cyclic number.

It is not a de Polignac number, because 209631241 - 2¹ = 209631239 is a prime.

Together with 209631239, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (209631221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104815620 + 104815621.

It is an arithmetic number, because the mean of its divisors is an integer number (104815621).

Almost surely, 2^209631241 is an apocalyptic number.

It is an amenable number.

209631241 is a deficient number, since it is larger than the sum of its proper divisors (1).

209631241 is an equidigital number, since it uses as much as digits as its factorization.

209631241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 209631241 is about 14478.6477614451. The cubic root of 209631241 is about 594.0440748093.

The spelling of 209631241 in words is "two hundred nine million, six hundred thirty-one thousand, two hundred forty-one".