5556121 has 2 divisors, whose sum is σ = 5556122. Its totient is φ = 5556120.

The previous prime is 5556107. The next prime is 5556137. The reversal of 5556121 is 1216555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5456896 + 99225 = 2336^2 + 315^2 .

It is a cyclic number.

It is not a de Polignac number, because 5556121 - 2⁷ = 5555993 is a prime.

5556121 is a lucky number.

It is equal to p₃₈₄₃₆₁ and since 5556121 and 384361 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (5556191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2778060 + 2778061.

It is an arithmetic number, because the mean of its divisors is an integer number (2778061).

Almost surely, 2^5556121 is an apocalyptic number.

It is an amenable number.

5556121 is a deficient number, since it is larger than the sum of its proper divisors (1).

5556121 is an equidigital number, since it uses as much as digits as its factorization.

5556121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1500, while the sum is 25.

The square root of 5556121 is about 2357.1425497835. The cubic root of 5556121 is about 177.1157700704.

It can be divided in two parts, 5556 and 121, that multiplied together give a palindrome (672276).

The spelling of 5556121 in words is "five million, five hundred fifty-six thousand, one hundred twenty-one".