1213156843 has 2 divisors, whose sum is σ = 1213156844. Its totient is φ = 1213156842.

The previous prime is 1213156823. The next prime is 1213156849. The reversal of 1213156843 is 3486513121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213156843 - 2²⁹ = 676285931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213156799 and 1213156808.

It is not a weakly prime, because it can be changed into another prime (1213156849) 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, 606578421 + 606578422.

It is an arithmetic number, because the mean of its divisors is an integer number (606578422).

Almost surely, 2^1213156843 is an apocalyptic number.

1213156843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213156843 is an equidigital number, since it uses as much as digits as its factorization.

1213156843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 1213156843 is about 34830.4011317699. The cubic root of 1213156843 is about 1066.5281369685.

Adding to 1213156843 its reverse (3486513121), we get a palindrome (4699669964).

The spelling of 1213156843 in words is "one billion, two hundred thirteen million, one hundred fifty-six thousand, eight hundred forty-three".