555561001 has 4 divisors (see below), whose sum is σ = 561288532. Its totient is φ = 549833472.

The previous prime is 555560983. The next prime is 555561011. The reversal of 555561001 is 100165555.

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 370601001 + 184960000 = 19251^2 + 13600^2 .

It is a cyclic number.

It is not a de Polignac number, because 555561001 - 2¹⁷ = 555429929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (555561011) 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 3 ways as a sum of consecutive naturals, for example, 2863620 + ... + 2863813.

It is an arithmetic number, because the mean of its divisors is an integer number (140322133).

Almost surely, 2^555561001 is an apocalyptic number.

It is an amenable number.

555561001 is a deficient number, since it is larger than the sum of its proper divisors (5727531).

555561001 is an equidigital number, since it uses as much as digits as its factorization.

555561001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5727530.

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

The square root of 555561001 is about 23570.3415545893. The cubic root of 555561001 is about 822.0733773589.

The spelling of 555561001 in words is "five hundred fifty-five million, five hundred sixty-one thousand, one".