1212891943 has 2 divisors, whose sum is σ = 1212891944. Its totient is φ = 1212891942.

The previous prime is 1212891937. The next prime is 1212891949. The reversal of 1212891943 is 3491982121.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1212891937) and next prime (1212891949).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212891943 is a prime.

It is a super-2 number, since 2×1212891943² = 2942213730788630498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1212891896 and 1212891905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212891949) 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, 606445971 + 606445972.

It is an arithmetic number, because the mean of its divisors is an integer number (606445972).

Almost surely, 2^1212891943 is an apocalyptic number.

1212891943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212891943 is an equidigital number, since it uses as much as digits as its factorization.

1212891943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 40.

The square root of 1212891943 is about 34826.5982117117. The cubic root of 1212891943 is about 1066.4505037338.

The spelling of 1212891943 in words is "one billion, two hundred twelve million, eight hundred ninety-one thousand, nine hundred forty-three".