1213243049 has 2 divisors, whose sum is σ = 1213243050. Its totient is φ = 1213243048.

The previous prime is 1213243039. The next prime is 1213243127. The reversal of 1213243049 is 9403423121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 733326400 + 479916649 = 27080^2 + 21907^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213243049 - 2¹⁶ = 1213177513 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213243039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606621524 + 606621525.

It is an arithmetic number, because the mean of its divisors is an integer number (606621525).

Almost surely, 2^1213243049 is an apocalyptic number.

It is an amenable number.

1213243049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213243049 is an equidigital number, since it uses as much as digits as its factorization.

1213243049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1213243049 is about 34831.6386206564. The cubic root of 1213243049 is about 1066.5533985955.

The spelling of 1213243049 in words is "one billion, two hundred thirteen million, two hundred forty-three thousand, forty-nine".