606821 has 4 divisors (see below), whose sum is σ = 609600. Its totient is φ = 604044.

The previous prime is 606811. The next prime is 606829. The reversal of 606821 is 128606.

606821 is nontrivially palindromic in base 15.

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, and also an emirpimes, since its reverse is a distinct semiprime: 128606 = 2 ⋅64303.

It is a cyclic number.

It is not a de Polignac number, because 606821 - 2⁶ = 606757 is a prime.

It is a Duffinian number.

606821 is an undulating number in base 15.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (606829) 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, 1031 + ... + 1508.

It is an arithmetic number, because the mean of its divisors is an integer number (152400).

2⁶⁰⁶⁸²¹ is an apocalyptic number.

It is an amenable number.

606821 is a deficient number, since it is larger than the sum of its proper divisors (2779).

606821 is a wasteful number, since it uses less digits than its factorization.

606821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2778.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 606821 is about 778.9871629238. The cubic root of 606821 is about 84.6616770849.

The spelling of 606821 in words is "six hundred six thousand, eight hundred twenty-one".