550005381 has 6 divisors (see below), whose sum is σ = 794452230. Its totient is φ = 366670248.

The previous prime is 550005373. The next prime is 550005409. The reversal of 550005381 is 183500055.

It can be written as a sum of positive squares in only one way, i.e., 419840100 + 130165281 = 20490^2 + 11409^2 .

It is not a de Polignac number, because 550005381 - 2³ = 550005373 is a prime.

It is a super-2 number, since 2×550005381² = 605011838257910322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550005581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30555846 + ... + 30555863.

It is an arithmetic number, because the mean of its divisors is an integer number (132408705).

Almost surely, 2^550005381 is an apocalyptic number.

It is an amenable number.

550005381 is a deficient number, since it is larger than the sum of its proper divisors (244446849).

550005381 is a wasteful number, since it uses less digits than its factorization.

550005381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61111715 (or 61111712 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 550005381 is about 23452.1935221420. The cubic root of 550005381 is about 819.3239425724.

The spelling of 550005381 in words is "five hundred fifty million, five thousand, three hundred eighty-one".