1240109509 has 2 divisors, whose sum is σ = 1240109510. Its totient is φ = 1240109508.

The previous prime is 1240109503. The next prime is 1240109527. The reversal of 1240109509 is 9059010421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1017801409 + 222308100 = 31903^2 + 14910^2 .

It is an emirp because it is prime and its reverse (9059010421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1240109509 - 2¹⁵ = 1240076741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240109503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620054754 + 620054755.

It is an arithmetic number, because the mean of its divisors is an integer number (620054755).

Almost surely, 2^1240109509 is an apocalyptic number.

It is an amenable number.

1240109509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240109509 is an equidigital number, since it uses as much as digits as its factorization.

1240109509 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 31.

The square root of 1240109509 is about 35215.1886123019. The cubic root of 1240109509 is about 1074.3686962887.

The spelling of 1240109509 in words is "one billion, two hundred forty million, one hundred nine thousand, five hundred nine".