555240121 has 2 divisors, whose sum is σ = 555240122. Its totient is φ = 555240120.

The previous prime is 555240109. The next prime is 555240149. The reversal of 555240121 is 121042555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 330839721 + 224400400 = 18189^2 + 14980^2 .

It is a cyclic number.

It is not a de Polignac number, because 555240121 - 2¹⁵ = 555207353 is a prime.

It is not a weakly prime, because it can be changed into another prime (555240181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277620060 + 277620061.

It is an arithmetic number, because the mean of its divisors is an integer number (277620061).

Almost surely, 2^555240121 is an apocalyptic number.

It is an amenable number.

555240121 is a deficient number, since it is larger than the sum of its proper divisors (1).

555240121 is an equidigital number, since it uses as much as digits as its factorization.

555240121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 555240121 is about 23563.5337120730. The cubic root of 555240121 is about 821.9150762860.

Adding to 555240121 its reverse (121042555), we get a palindrome (676282676).

The spelling of 555240121 in words is "five hundred fifty-five million, two hundred forty thousand, one hundred twenty-one".