549691 has 2 divisors, whose sum is σ = 549692. Its totient is φ = 549690.

The previous prime is 549683. The next prime is 549701. The reversal of 549691 is 196945.

549691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 549691 - 2³ = 549683 is a prime.

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, 274845 + 274846.

It is an arithmetic number, because the mean of its divisors is an integer number (274846).

2⁵⁴⁹⁶⁹¹ is an apocalyptic number.

549691 is a deficient number, since it is larger than the sum of its proper divisors (1).

549691 is an equidigital number, since it uses as much as digits as its factorization.

549691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 34.

The square root of 549691 is about 741.4114916833. The cubic root of 549691 is about 81.9167805328.

The spelling of 549691 in words is "five hundred forty-nine thousand, six hundred ninety-one".