1213450445209 has 2 divisors, whose sum is σ = 1213450445210. Its totient is φ = 1213450445208.

The previous prime is 1213450445203. The next prime is 1213450445237. The reversal of 1213450445209 is 9025440543121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1068335161609 + 145115283600 = 1033603^2 + 380940^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213450445209 - 2¹⁷ = 1213450314137 is a prime.

It is a super-2 number, since 2×1213450445209² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1213450445203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606725222604 + 606725222605.

It is an arithmetic number, because the mean of its divisors is an integer number (606725222605).

Almost surely, 2^{1213450445209} is an apocalyptic number.

It is an amenable number.

1213450445209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213450445209 is an equidigital number, since it uses as much as digits as its factorization.

1213450445209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 1213450445209 in words is "one trillion, two hundred thirteen billion, four hundred fifty million, four hundred forty-five thousand, two hundred nine".