1242544441 has 4 divisors (see below), whose sum is σ = 1262914084. Its totient is φ = 1222174800.

The previous prime is 1242544427. The next prime is 1242544447. The reversal of 1242544441 is 1444452421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 93605625 + 1148938816 = 9675^2 + 33896^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242544441 - 2⁵ = 1242544409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242544447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10184730 + ... + 10184851.

It is an arithmetic number, because the mean of its divisors is an integer number (315728521).

Almost surely, 2^1242544441 is an apocalyptic number.

It is an amenable number.

1242544441 is a deficient number, since it is larger than the sum of its proper divisors (20369643).

1242544441 is an equidigital number, since it uses as much as digits as its factorization.

1242544441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20369642.

The product of its digits is 20480, while the sum is 31.

The square root of 1242544441 is about 35249.7438430409. The cubic root of 1242544441 is about 1075.0714042349.

Adding to 1242544441 its reverse (1444452421), we get a palindrome (2686996862).

The spelling of 1242544441 in words is "one billion, two hundred forty-two million, five hundred forty-four thousand, four hundred forty-one".