309202241 has 2 divisors, whose sum is σ = 309202242. Its totient is φ = 309202240.

The previous prime is 309202217. The next prime is 309202343. The reversal of 309202241 is 142202903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 301890625 + 7311616 = 17375^2 + 2704^2 .

It is an emirp because it is prime and its reverse (142202903) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309202241 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (309202541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154601120 + 154601121.

It is an arithmetic number, because the mean of its divisors is an integer number (154601121).

Almost surely, 2^309202241 is an apocalyptic number.

It is an amenable number.

309202241 is a deficient number, since it is larger than the sum of its proper divisors (1).

309202241 is an equidigital number, since it uses as much as digits as its factorization.

309202241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 309202241 is about 17584.1474345502. The cubic root of 309202241 is about 676.2088924414.

The spelling of 309202241 in words is "three hundred nine million, two hundred two thousand, two hundred forty-one".