1243005506 has 16 divisors (see below), whose sum is σ = 1887478200. Its totient is φ = 613861248.

The previous prime is 1243005503. The next prime is 1243005509. The reversal of 1243005506 is 6055003421.

It is an interprime number because it is at equal distance from previous prime (1243005503) and next prime (1243005509).

It can be written as a sum of positive squares in 4 ways, for example, as 855270025 + 387735481 = 29245^2 + 19691^2 .

It is not an unprimeable number, because it can be changed into a prime (1243005503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191360 + ... + 197748.

Almost surely, 2^1243005506 is an apocalyptic number.

1243005506 is a deficient number, since it is larger than the sum of its proper divisors (644472694).

1243005506 is a wasteful number, since it uses less digits than its factorization.

1243005506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7573.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1243005506 is about 35256.2832130671. The cubic root of 1243005506 is about 1075.2043616524.

Adding to 1243005506 its reverse (6055003421), we get a palindrome (7298008927).

The spelling of 1243005506 in words is "one billion, two hundred forty-three million, five thousand, five hundred six".