115243309 has 2 divisors, whose sum is σ = 115243310. Its totient is φ = 115243308.

The previous prime is 115243307. The next prime is 115243319. The reversal of 115243309 is 903342511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88172100 + 27071209 = 9390^2 + 5203^2 .

It is a cyclic number.

It is not a de Polignac number, because 115243309 - 2¹ = 115243307 is a prime.

Together with 115243307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115243307) 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, 57621654 + 57621655.

It is an arithmetic number, because the mean of its divisors is an integer number (57621655).

Almost surely, 2^115243309 is an apocalyptic number.

It is an amenable number.

115243309 is a deficient number, since it is larger than the sum of its proper divisors (1).

115243309 is an equidigital number, since it uses as much as digits as its factorization.

115243309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 115243309 is about 10735.1436413306. The cubic root of 115243309 is about 486.6371274892.

The spelling of 115243309 in words is "one hundred fifteen million, two hundred forty-three thousand, three hundred nine".