605621 has 4 divisors (see below), whose sum is σ = 607200. Its totient is φ = 604044.

The previous prime is 605617. The next prime is 605629. The reversal of 605621 is 126506.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 605621 - 2² = 605617 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 605593 and 605602.

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 605621.

It is not an unprimeable number, because it can be changed into a prime (605629) 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, 200 + ... + 1118.

It is an arithmetic number, because the mean of its divisors is an integer number (151800).

2⁶⁰⁵⁶²¹ is an apocalyptic number.

It is an amenable number.

605621 is a deficient number, since it is larger than the sum of its proper divisors (1579).

605621 is an equidigital number, since it uses as much as digits as its factorization.

605621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 605621 is about 778.2165508392. The cubic root of 605621 is about 84.6058335691.

The spelling of 605621 in words is "six hundred five thousand, six hundred twenty-one".