1213543841 has 2 divisors, whose sum is σ = 1213543842. Its totient is φ = 1213543840.

The previous prime is 1213543829. The next prime is 1213543879. The reversal of 1213543841 is 1483453121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1041933841 + 171610000 = 32279^2 + 13100^2 .

It is an emirp because it is prime and its reverse (1483453121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213543841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213543798 and 1213543807.

It is not a weakly prime, because it can be changed into another prime (1213543811) 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, 606771920 + 606771921.

It is an arithmetic number, because the mean of its divisors is an integer number (606771921).

Almost surely, 2^1213543841 is an apocalyptic number.

It is an amenable number.

1213543841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213543841 is an equidigital number, since it uses as much as digits as its factorization.

1213543841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 32.

The square root of 1213543841 is about 34835.9561516546. The cubic root of 1213543841 is about 1066.6415326868.

Adding to 1213543841 its reverse (1483453121), we get a palindrome (2696996962).

The spelling of 1213543841 in words is "one billion, two hundred thirteen million, five hundred forty-three thousand, eight hundred forty-one".