1200100043 has 2 divisors, whose sum is σ = 1200100044. Its totient is φ = 1200100042.

The previous prime is 1200100019. The next prime is 1200100063. The reversal of 1200100043 is 3400010021.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (3400010021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1200100043 - 2¹² = 1200095947 is a prime.

It is a super-2 number, since 2×1200100043² = 2880480226417203698, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1200099997 and 1200100033.

It is not a weakly prime, because it can be changed into another prime (1200100063) 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, 600050021 + 600050022.

It is an arithmetic number, because the mean of its divisors is an integer number (600050022).

Almost surely, 2^1200100043 is an apocalyptic number.

1200100043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200100043 is an equidigital number, since it uses as much as digits as its factorization.

1200100043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1200100043 is about 34642.4601176071. The cubic root of 1200100043 is about 1062.6880993484.

Adding to 1200100043 its reverse (3400010021), we get a palindrome (4600110064).

The spelling of 1200100043 in words is "one billion, two hundred million, one hundred thousand, forty-three".