555561 has 6 divisors (see below), whose sum is σ = 802490. Its totient is φ = 370368.

The previous prime is 555557. The next prime is 555589. The reversal of 555561 is 165555.

It can be written as a sum of positive squares in only one way, i.e., 553536 + 2025 = 744^2 + 45^2 .

It is not a de Polignac number, because 555561 - 2² = 555557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (555521) 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, 30856 + ... + 30873.

2⁵⁵⁵⁵⁶¹ is an apocalyptic number.

It is an amenable number.

555561 is a deficient number, since it is larger than the sum of its proper divisors (246929).

555561 is a wasteful number, since it uses less digits than its factorization.

555561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61735 (or 61732 counting only the distinct ones).

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

The square root of 555561 is about 745.3596447353. The cubic root of 555561 is about 82.2073376866.

The spelling of 555561 in words is "five hundred fifty-five thousand, five hundred sixty-one".