549855121 has 2 divisors, whose sum is σ = 549855122. Its totient is φ = 549855120.

The previous prime is 549855067. The next prime is 549855127. The reversal of 549855121 is 121558945.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 354945600 + 194909521 = 18840^2 + 13961^2 .

It is a cyclic number.

It is not a de Polignac number, because 549855121 - 2¹⁵ = 549822353 is a prime.

It is not a weakly prime, because it can be changed into another prime (549855127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274927560 + 274927561.

It is an arithmetic number, because the mean of its divisors is an integer number (274927561).

Almost surely, 2^549855121 is an apocalyptic number.

It is an amenable number.

549855121 is a deficient number, since it is larger than the sum of its proper divisors (1).

549855121 is an equidigital number, since it uses as much as digits as its factorization.

549855121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72000, while the sum is 40.

The square root of 549855121 is about 23448.9897650197. The cubic root of 549855121 is about 819.2493234063.

It can be divided in two parts, 54985 and 5121, that added together give a palindrome (60106).

The spelling of 549855121 in words is "five hundred forty-nine million, eight hundred fifty-five thousand, one hundred twenty-one".