616621 has 4 divisors (see below), whose sum is σ = 636544. Its totient is φ = 596700.

The previous prime is 616597. The next prime is 616639. The reversal of 616621 is 126616.

616621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 616621 - 2⁵ = 616589 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 = 616592 and 616601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616321) 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, 9915 + ... + 9976.

It is an arithmetic number, because the mean of its divisors is an integer number (159136).

2⁶¹⁶⁶²¹ is an apocalyptic number.

It is an amenable number.

616621 is a deficient number, since it is larger than the sum of its proper divisors (19923).

616621 is a wasteful number, since it uses less digits than its factorization.

616621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19922.

The product of its digits is 432, while the sum is 22.

The square root of 616621 is about 785.2521887903. The cubic root of 616621 is about 85.1150000508.

The spelling of 616621 in words is "six hundred sixteen thousand, six hundred twenty-one".