1213444181 has 2 divisors, whose sum is σ = 1213444182. Its totient is φ = 1213444180.

The previous prime is 1213444157. The next prime is 1213444237. The reversal of 1213444181 is 1814443121.

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., 1143454225 + 69989956 = 33815^2 + 8366^2 .

It is an emirp because it is prime and its reverse (1814443121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1213444181 - 2¹⁴ = 1213427797 is a prime.

It is a super-2 number, since 2×1213444181² = 2944893560805521522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213444121) 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, 606722090 + 606722091.

It is an arithmetic number, because the mean of its divisors is an integer number (606722091).

Almost surely, 2^1213444181 is an apocalyptic number.

It is an amenable number.

1213444181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213444181 is an equidigital number, since it uses as much as digits as its factorization.

1213444181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 29.

The square root of 1213444181 is about 34834.5257036751. The cubic root of 1213444181 is about 1066.6123332459.

The spelling of 1213444181 in words is "one billion, two hundred thirteen million, four hundred forty-four thousand, one hundred eighty-one".