1213242409 has 2 divisors, whose sum is σ = 1213242410. Its totient is φ = 1213242408.

The previous prime is 1213242403. The next prime is 1213242419. The reversal of 1213242409 is 9042423121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 990486784 + 222755625 = 31472^2 + 14925^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213242409 - 2²⁹ = 676371497 is a prime.

It is a super-2 number, since 2×1213242409² = 2943914285992246562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1213242403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606621204 + 606621205.

It is an arithmetic number, because the mean of its divisors is an integer number (606621205).

Almost surely, 2^1213242409 is an apocalyptic number.

It is an amenable number.

1213242409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213242409 is an equidigital number, since it uses as much as digits as its factorization.

1213242409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1213242409 is about 34831.6294336053. The cubic root of 1213242409 is about 1066.5532110556.

The spelling of 1213242409 in words is "one billion, two hundred thirteen million, two hundred forty-two thousand, four hundred nine".