243961307 has 2 divisors, whose sum is σ = 243961308. Its totient is φ = 243961306.

The previous prime is 243961301. The next prime is 243961321. The reversal of 243961307 is 703169342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243961307 - 2⁸ = 243961051 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (243961301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121980653 + 121980654.

It is an arithmetic number, because the mean of its divisors is an integer number (121980654).

Almost surely, 2^243961307 is an apocalyptic number.

243961307 is a deficient number, since it is larger than the sum of its proper divisors (1).

243961307 is an equidigital number, since it uses as much as digits as its factorization.

243961307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 243961307 is about 15619.2607699596. The cubic root of 243961307 is about 624.8469444948.

The spelling of 243961307 in words is "two hundred forty-three million, nine hundred sixty-one thousand, three hundred seven".