550943581 has 4 divisors (see below), whose sum is σ = 551367712. Its totient is φ = 550519452.

The previous prime is 550943573. The next prime is 550943611. The reversal of 550943581 is 185349055.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 550943581 - 2³ = 550943573 is a prime.

It is a super-2 number, since 2×550943581² = 607077658890207122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550943681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210111 + ... + 212716.

It is an arithmetic number, because the mean of its divisors is an integer number (137841928).

Almost surely, 2^550943581 is an apocalyptic number.

It is an amenable number.

550943581 is a deficient number, since it is larger than the sum of its proper divisors (424131).

550943581 is a wasteful number, since it uses less digits than its factorization.

550943581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424130.

The product of its (nonzero) digits is 108000, while the sum is 40.

The square root of 550943581 is about 23472.1873927421. The cubic root of 550943581 is about 819.7895459318.

The spelling of 550943581 in words is "five hundred fifty million, nine hundred forty-three thousand, five hundred eighty-one".