555681 has 16 divisors (see below), whose sum is σ = 866304. Its totient is φ = 310224.

The previous prime is 555677. The next prime is 555683. The reversal of 555681 is 186555.

It is a happy number.

It is not a de Polignac number, because 555681 - 2² = 555677 is a prime.

It is a super-2 number, since 2×555681² = 617562747522, which contains 22 as substring.

555681 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 706 + ... + 1268.

It is an arithmetic number, because the mean of its divisors is an integer number (54144).

2⁵⁵⁵⁶⁸¹ is an apocalyptic number.

It is an amenable number.

555681 is a deficient number, since it is larger than the sum of its proper divisors (310623).

555681 is a wasteful number, since it uses less digits than its factorization.

555681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620.

The product of its digits is 6000, while the sum is 30.

The square root of 555681 is about 745.4401384417. The cubic root of 555681 is about 82.2132561308.

The spelling of 555681 in words is "five hundred fifty-five thousand, six hundred eighty-one".