550809139 has 2 divisors, whose sum is σ = 550809140. Its totient is φ = 550809138.

The previous prime is 550809137. The next prime is 550809169. The reversal of 550809139 is 931908055.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 550809139 - 2¹ = 550809137 is a prime.

Together with 550809137, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (550809137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275404569 + 275404570.

It is an arithmetic number, because the mean of its divisors is an integer number (275404570).

Almost surely, 2^550809139 is an apocalyptic number.

550809139 is a deficient number, since it is larger than the sum of its proper divisors (1).

550809139 is an equidigital number, since it uses as much as digits as its factorization.

550809139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 550809139 is about 23469.3233605062. The cubic root of 550809139 is about 819.7228584548.

The spelling of 550809139 in words is "five hundred fifty million, eight hundred nine thousand, one hundred thirty-nine".