309241 has 2 divisors, whose sum is σ = 309242. Its totient is φ = 309240.

The previous prime is 309223. The next prime is 309251. The reversal of 309241 is 142903.

309241 is nontrivially palindromic in base 13.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254016 + 55225 = 504^2 + 235^2 .

It is an emirp because it is prime and its reverse (142903) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 309241 - 2¹⁷ = 178169 is a prime.

It is not a weakly prime, because it can be changed into another prime (309251) 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, 154620 + 154621.

It is an arithmetic number, because the mean of its divisors is an integer number (154621).

2³⁰⁹²⁴¹ is an apocalyptic number.

It is an amenable number.

309241 is a deficient number, since it is larger than the sum of its proper divisors (1).

309241 is an equidigital number, since it uses as much as digits as its factorization.

309241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 309241 is about 556.0944164438. The cubic root of 309241 is about 67.6237145886.

The spelling of 309241 in words is "three hundred nine thousand, two hundred forty-one".