549151 has 4 divisors (see below), whose sum is σ = 581472. Its totient is φ = 516832.

The previous prime is 549149. The next prime is 549161. The reversal of 549151 is 151945.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 151945 = 5 ⋅30389.

It is a cyclic number.

It is not a de Polignac number, because 549151 - 2¹ = 549149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (549121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16135 + ... + 16168.

It is an arithmetic number, because the mean of its divisors is an integer number (145368).

2⁵⁴⁹¹⁵¹ is an apocalyptic number.

549151 is a deficient number, since it is larger than the sum of its proper divisors (32321).

549151 is a wasteful number, since it uses less digits than its factorization.

549151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32320.

The product of its digits is 900, while the sum is 25.

The square root of 549151 is about 741.0472319630. The cubic root of 549151 is about 81.8899475458.

The spelling of 549151 in words is "five hundred forty-nine thousand, one hundred fifty-one".