1005556105 has 4 divisors (see below), whose sum is σ = 1206667332. Its totient is φ = 804444880.

The previous prime is 1005556091. The next prime is 1005556109. The reversal of 1005556105 is 5016555001.

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 627953481 + 377602624 = 25059^2 + 19432^2 .

It is not a de Polignac number, because 1005556105 - 2⁵ = 1005556073 is a prime.

It is a super-2 number, since 2×1005556105² = 2022286160605542050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1005556109) 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, 100555606 + ... + 100555615.

It is an arithmetic number, because the mean of its divisors is an integer number (301666833).

Almost surely, 2^1005556105 is an apocalyptic number.

It is an amenable number.

1005556105 is a deficient number, since it is larger than the sum of its proper divisors (201111227).

1005556105 is an equidigital number, since it uses as much as digits as its factorization.

1005556105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201111226.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 1005556105 is about 31710.5046475139. The cubic root of 1005556105 is about 1001.8486155149.

The spelling of 1005556105 in words is "one billion, five million, five hundred fifty-six thousand, one hundred five".