546821 has 4 divisors (see below), whose sum is σ = 596544. Its totient is φ = 497100.

The previous prime is 546781. The next prime is 546841. The reversal of 546821 is 128645.

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 a de Polignac number, because none of the positive numbers 2^k-546821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 546821.

It is not an unprimeable number, because it can be changed into a prime (546841) 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, 24845 + ... + 24866.

It is an arithmetic number, because the mean of its divisors is an integer number (149136).

2⁵⁴⁶⁸²¹ is an apocalyptic number.

It is an amenable number.

546821 is a deficient number, since it is larger than the sum of its proper divisors (49723).

546821 is a wasteful number, since it uses less digits than its factorization.

546821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49722.

The product of its digits is 1920, while the sum is 26.

The square root of 546821 is about 739.4734613223. The cubic root of 546821 is about 81.7739660458.

The spelling of 546821 in words is "five hundred forty-six thousand, eight hundred twenty-one".