1213213249 has 2 divisors, whose sum is σ = 1213213250. Its totient is φ = 1213213248.

The previous prime is 1213213237. The next prime is 1213213319. The reversal of 1213213249 is 9423123121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658846224 + 554367025 = 25668^2 + 23545^2 .

It is an emirp because it is prime and its reverse (9423123121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213213249 - 2⁵ = 1213213217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213213549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606606624 + 606606625.

It is an arithmetic number, because the mean of its divisors is an integer number (606606625).

Almost surely, 2^1213213249 is an apocalyptic number.

It is an amenable number.

1213213249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213213249 is an equidigital number, since it uses as much as digits as its factorization.

1213213249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 1213213249 is about 34831.2108460214. The cubic root of 1213213249 is about 1066.5446662008.

The spelling of 1213213249 in words is "one billion, two hundred thirteen million, two hundred thirteen thousand, two hundred forty-nine".