550809138 has 32 divisors (see below), whose sum is σ = 1221475392. Its totient is φ = 164174400.

The previous prime is 550809137. The next prime is 550809139. The reversal of 550809138 is 831908055.

It is an interprime number because it is at equal distance from previous prime (550809137) and next prime (550809139).

It is a junction number, because it is equal to n+sod(n) for n = 550809096 and 550809105.

It is not an unprimeable number, because it can be changed into a prime (550809137) 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 in 15 ways as a sum of consecutive naturals, for example, 64381 + ... + 72432.

It is an arithmetic number, because the mean of its divisors is an integer number (38171106).

Almost surely, 2^550809138 is an apocalyptic number.

550809138 is an abundant number, since it is smaller than the sum of its proper divisors (670666254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

550809138 is a wasteful number, since it uses less digits than its factorization.

550809138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136890.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 550809138 is about 23469.3233392018. The cubic root of 550809138 is about 819.7228579587.

The spelling of 550809138 in words is "five hundred fifty million, eight hundred nine thousand, one hundred thirty-eight".