1235240309 has 2 divisors, whose sum is σ = 1235240310. Its totient is φ = 1235240308.

The previous prime is 1235240299. The next prime is 1235240311. The reversal of 1235240309 is 9030425321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1230466084 + 4774225 = 35078^2 + 2185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1235240309 - 2⁸ = 1235240053 is a prime.

Together with 1235240311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1235240329) 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, 617620154 + 617620155.

It is an arithmetic number, because the mean of its divisors is an integer number (617620155).

Almost surely, 2^1235240309 is an apocalyptic number.

It is an amenable number.

1235240309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1235240309 is an equidigital number, since it uses as much as digits as its factorization.

1235240309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 1235240309 is about 35145.9856740425. The cubic root of 1235240309 is about 1072.9607083149.

The spelling of 1235240309 in words is "one billion, two hundred thirty-five million, two hundred forty thousand, three hundred nine".