549643 has 2 divisors, whose sum is σ = 549644. Its totient is φ = 549642.

The previous prime is 549641. The next prime is 549649. The reversal of 549643 is 346945.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 549643 - 2¹ = 549641 is a prime.

Together with 549641, it forms a pair of twin primes.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (549641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274821 + 274822.

It is an arithmetic number, because the mean of its divisors is an integer number (274822).

2⁵⁴⁹⁶⁴³ is an apocalyptic number.

549643 is a deficient number, since it is larger than the sum of its proper divisors (1).

549643 is an equidigital number, since it uses as much as digits as its factorization.

549643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 549643 is about 741.3791202887. The cubic root of 549643 is about 81.9143960902.

It can be divided in two parts, 5496 and 43, that multiplied together give a triangular number (236328 = T₆₈₇).

The spelling of 549643 in words is "five hundred forty-nine thousand, six hundred forty-three".