1243212041 has 4 divisors (see below), whose sum is σ = 1243290132. Its totient is φ = 1243133952.

The previous prime is 1243212029. The next prime is 1243212053. The reversal of 1243212041 is 1402123421.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1402123421 = 1481 ⋅946741.

It is an interprime number because it is at equal distance from previous prime (1243212029) and next prime (1243212053).

It can be written as a sum of positive squares in 2 ways, for example, as 593166025 + 650046016 = 24355^2 + 25496^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243212041 - 2¹⁰ = 1243211017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243812041) 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 in 3 ways as a sum of consecutive naturals, for example, 5636 + ... + 50181.

It is an arithmetic number, because the mean of its divisors is an integer number (310822533).

Almost surely, 2^1243212041 is an apocalyptic number.

It is an amenable number.

1243212041 is a deficient number, since it is larger than the sum of its proper divisors (78091).

1243212041 is an equidigital number, since it uses as much as digits as its factorization.

1243212041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78090.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1243212041 is about 35259.2121437788. The cubic root of 1243212041 is about 1075.2639095341.

Adding to 1243212041 its reverse (1402123421), we get a palindrome (2645335462).

The spelling of 1243212041 in words is "one billion, two hundred forty-three million, two hundred twelve thousand, forty-one".