556121 has 4 divisors (see below), whose sum is σ = 588852. Its totient is φ = 523392.

The previous prime is 556103. The next prime is 556123. The reversal of 556121 is 121655.

556121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 366025 + 190096 = 605^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 556121 - 2¹⁰ = 555097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 556093 and 556102.

It is not an unprimeable number, because it can be changed into a prime (556123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16340 + ... + 16373.

It is an arithmetic number, because the mean of its divisors is an integer number (147213).

2⁵⁵⁶¹²¹ is an apocalyptic number.

It is an amenable number.

556121 is a deficient number, since it is larger than the sum of its proper divisors (32731).

556121 is a wasteful number, since it uses less digits than its factorization.

556121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32730.

The product of its digits is 300, while the sum is 20.

The square root of 556121 is about 745.7352076977. The cubic root of 556121 is about 82.2349498058.

Adding to 556121 its reverse (121655), we get a palindrome (677776).

It can be divided in two parts, 556 and 121, that multiplied together give a palindrome (67276).

The spelling of 556121 in words is "five hundred fifty-six thousand, one hundred twenty-one".