549918139 has 2 divisors, whose sum is σ = 549918140. Its totient is φ = 549918138.

The previous prime is 549918119. The next prime is 549918157. The reversal of 549918139 is 931819945.

549918139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 549918139 - 2⁵ = 549918107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 549918092 and 549918101.

It is not a weakly prime, because it can be changed into another prime (549918119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274959069 + 274959070.

It is an arithmetic number, because the mean of its divisors is an integer number (274959070).

Almost surely, 2^549918139 is an apocalyptic number.

549918139 is a deficient number, since it is larger than the sum of its proper divisors (1).

549918139 is an equidigital number, since it uses as much as digits as its factorization.

549918139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 49.

The square root of 549918139 is about 23450.3334517870. Note that the first 3 decimals coincide. The cubic root of 549918139 is about 819.2806198210.

The spelling of 549918139 in words is "five hundred forty-nine million, nine hundred eighteen thousand, one hundred thirty-nine".