556001001 has 6 divisors (see below), whose sum is σ = 803112570. Its totient is φ = 370667328.

The previous prime is 556000999. The next prime is 556001003. The reversal of 556001001 is 100100655.

556001001 is a `hidden beast` number, since 5 + 560 + 0 + 100 + 1 = 666.

556001001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (556000999) and next prime (556001003).

It can be written as a sum of positive squares in only one way, i.e., 549949401 + 6051600 = 23451^2 + 2460^2 .

It is not a de Polignac number, because 556001001 - 2¹ = 556000999 is a prime.

It is a super-2 number, since 2×556001001² = 618274226226004002, which contains 22 as substring.

556001001 is a modest number, since divided by 1001 gives 556 as remainder.

It is not an unprimeable number, because it can be changed into a prime (556001003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30888936 + ... + 30888953.

It is an arithmetic number, because the mean of its divisors is an integer number (133852095).

Almost surely, 2^556001001 is an apocalyptic number.

It is an amenable number.

556001001 is a deficient number, since it is larger than the sum of its proper divisors (247111569).

556001001 is a wasteful number, since it uses less digits than its factorization.

556001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61777895 (or 61777892 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 556001001 is about 23579.6734710216. The cubic root of 556001001 is about 822.2903453344.

Adding to 556001001 its reverse (100100655), we get a palindrome (656101656).

The spelling of 556001001 in words is "five hundred fifty-six million, one thousand, one".