505556001 has 6 divisors (see below), whose sum is σ = 730247570. Its totient is φ = 337037328.

The previous prime is 505555991. The next prime is 505556021. The reversal of 505556001 is 100655505.

505556001 is a `hidden beast` number, since 5 + 0 + 5 + 55 + 600 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 366339600 + 139216401 = 19140^2 + 11799^2 .

It is not a de Polignac number, because 505556001 - 2⁷ = 505555873 is a prime.

It is a super-2 number, since 2×505556001² = 511173740294224002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505556021) 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 5 ways as a sum of consecutive naturals, for example, 28086436 + ... + 28086453.

Almost surely, 2^505556001 is an apocalyptic number.

It is an amenable number.

505556001 is a deficient number, since it is larger than the sum of its proper divisors (224691569).

505556001 is a wasteful number, since it uses less digits than its factorization.

505556001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56172895 (or 56172892 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 505556001 is about 22484.5725109463. The cubic root of 505556001 is about 796.6295707203.

The spelling of 505556001 in words is "five hundred five million, five hundred fifty-six thousand, one".