549551 has 2 divisors, whose sum is σ = 549552. Its totient is φ = 549550.

The previous prime is 549547. The next prime is 549553. The reversal of 549551 is 155945.

549551 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 549551 - 2² = 549547 is a prime.

It is a Sophie Germain prime.

Together with 549553, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (549553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274775 + 274776.

It is an arithmetic number, because the mean of its divisors is an integer number (274776).

2⁵⁴⁹⁵⁵¹ is an apocalyptic number.

549551 is a deficient number, since it is larger than the sum of its proper divisors (1).

549551 is an equidigital number, since it uses as much as digits as its factorization.

549551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4500, while the sum is 29.

The square root of 549551 is about 741.3170711646. The cubic root of 549551 is about 81.9098255205.

The spelling of 549551 in words is "five hundred forty-nine thousand, five hundred fifty-one".