1240241209 has 2 divisors, whose sum is σ = 1240241210. Its totient is φ = 1240241208.

The previous prime is 1240241179. The next prime is 1240241237. The reversal of 1240241209 is 9021420421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 998749609 + 241491600 = 31603^2 + 15540^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240241209 - 2¹⁵ = 1240208441 is a prime.

It is not a weakly prime, because it can be changed into another prime (1240241809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620120604 + 620120605.

It is an arithmetic number, because the mean of its divisors is an integer number (620120605).

Almost surely, 2^1240241209 is an apocalyptic number.

It is an amenable number.

1240241209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240241209 is an equidigital number, since it uses as much as digits as its factorization.

1240241209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 1240241209 is about 35217.0584944285. The cubic root of 1240241209 is about 1074.4067277012.

The spelling of 1240241209 in words is "one billion, two hundred forty million, two hundred forty-one thousand, two hundred nine".