1240231309 has 2 divisors, whose sum is σ = 1240231310. Its totient is φ = 1240231308.

The previous prime is 1240231301. The next prime is 1240231319. The reversal of 1240231309 is 9031320421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1239251209 + 980100 = 35203^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240231309 - 2³ = 1240231301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240231301) 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, 620115654 + 620115655.

It is an arithmetic number, because the mean of its divisors is an integer number (620115655).

Almost surely, 2^1240231309 is an apocalyptic number.

It is an amenable number.

1240231309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240231309 is an equidigital number, since it uses as much as digits as its factorization.

1240231309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1240231309 is about 35216.9179372642. The cubic root of 1240231309 is about 1074.4038689414.

The spelling of 1240231309 in words is "one billion, two hundred forty million, two hundred thirty-one thousand, three hundred nine".