555636121 has 4 divisors (see below), whose sum is σ = 555851700. Its totient is φ = 555420544.

The previous prime is 555636119. The next prime is 555636161. The reversal of 555636121 is 121636555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121636555 = 5 ⋅24327311.

It can be written as a sum of positive squares in 2 ways, for example, as 435974400 + 119661721 = 20880^2 + 10939^2 .

It is a cyclic number.

It is not a de Polignac number, because 555636121 - 2¹ = 555636119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (555636161) 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, 103876 + ... + 109093.

It is an arithmetic number, because the mean of its divisors is an integer number (138962925).

Almost surely, 2^555636121 is an apocalyptic number.

It is an amenable number.

555636121 is a deficient number, since it is larger than the sum of its proper divisors (215579).

555636121 is a wasteful number, since it uses less digits than its factorization.

555636121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215578.

The product of its digits is 27000, while the sum is 34.

The square root of 555636121 is about 23571.9350287582. The cubic root of 555636121 is about 822.1104278171.

The spelling of 555636121 in words is "five hundred fifty-five million, six hundred thirty-six thousand, one hundred twenty-one".