1240508633909 has 2 divisors, whose sum is σ = 1240508633910. Its totient is φ = 1240508633908.

The previous prime is 1240508633869. The next prime is 1240508633911. The reversal of 1240508633909 is 9093368050421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1034644980625 + 205863653284 = 1017175^2 + 453722^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240508633909 - 2²⁰ = 1240507585333 is a prime.

Together with 1240508633911, 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 (1240508633809) 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, 620254316954 + 620254316955.

It is an arithmetic number, because the mean of its divisors is an integer number (620254316955).

Almost surely, 2^{1240508633909} is an apocalyptic number.

It is an amenable number.

1240508633909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240508633909 is an equidigital number, since it uses as much as digits as its factorization.

1240508633909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The spelling of 1240508633909 in words is "one trillion, two hundred forty billion, five hundred eight million, six hundred thirty-three thousand, nine hundred nine".