1006243555 has 4 divisors (see below), whose sum is σ = 1207492272. Its totient is φ = 804994840.

The previous prime is 1006243543. The next prime is 1006243631. The reversal of 1006243555 is 5553426001.

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

It is a de Polignac number, because none of the positive numbers 2^k-1006243555 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100624351 + ... + 100624360.

It is an arithmetic number, because the mean of its divisors is an integer number (301873068).

Almost surely, 2^1006243555 is an apocalyptic number.

1006243555 is a deficient number, since it is larger than the sum of its proper divisors (201248717).

1006243555 is an equidigital number, since it uses as much as digits as its factorization.

1006243555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201248716.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 1006243555 is about 31721.3422635298. The cubic root of 1006243555 is about 1002.0768686306.

Adding to 1006243555 its reverse (5553426001), we get a palindrome (6559669556).

The spelling of 1006243555 in words is "one billion, six million, two hundred forty-three thousand, five hundred fifty-five".