555591 has 8 divisors (see below), whose sum is σ = 759024. Its totient is φ = 361280.

The previous prime is 555589. The next prime is 555593. The reversal of 555591 is 195555.

555591 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 (555589) and next prime (555593).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 555591 - 2¹ = 555589 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2136 + ... + 2381.

It is an arithmetic number, because the mean of its divisors is an integer number (94878).

2⁵⁵⁵⁵⁹¹ is an apocalyptic number.

555591 is a deficient number, since it is larger than the sum of its proper divisors (203433).

555591 is a wasteful number, since it uses less digits than its factorization.

555591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4561.

The product of its digits is 5625, while the sum is 30.

The square root of 555591 is about 745.3797689769. The cubic root of 555591 is about 82.2088173775.

It can be divided in two parts, 5555 and 91, that multiplied together give a palindrome (505505).

The spelling of 555591 in words is "five hundred fifty-five thousand, five hundred ninety-one".