1213906943 has 2 divisors, whose sum is σ = 1213906944. Its totient is φ = 1213906942.

The previous prime is 1213906921. The next prime is 1213906957. The reversal of 1213906943 is 3496093121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213906943 - 2¹⁰ = 1213905919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1213906897 and 1213906906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213906963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606953471 + 606953472.

It is an arithmetic number, because the mean of its divisors is an integer number (606953472).

Almost surely, 2^1213906943 is an apocalyptic number.

1213906943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213906943 is an equidigital number, since it uses as much as digits as its factorization.

1213906943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 1213906943 is about 34841.1673598919. The cubic root of 1213906943 is about 1066.7479046309.

The spelling of 1213906943 in words is "one billion, two hundred thirteen million, nine hundred six thousand, nine hundred forty-three".