654621 has 16 divisors (see below), whose sum is σ = 967680. Its totient is φ = 390320.

The previous prime is 654613. The next prime is 654623. The reversal of 654621 is 126456.

It is a cyclic number.

It is not a de Polignac number, because 654621 - 2³ = 654613 is a prime.

654621 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 654591 and 654600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2620 + ... + 2858.

It is an arithmetic number, because the mean of its divisors is an integer number (60480).

2⁶⁵⁴⁶²¹ is an apocalyptic number.

It is an amenable number.

654621 is a deficient number, since it is larger than the sum of its proper divisors (313059).

654621 is a wasteful number, since it uses less digits than its factorization.

654621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336.

The product of its digits is 1440, while the sum is 24.

The square root of 654621 is about 809.0865219493. The cubic root of 654621 is about 86.8287024505.

It can be divided in two parts, 654 and 621, that added together give a triangular number (1275 = T₅₀).

The spelling of 654621 in words is "six hundred fifty-four thousand, six hundred twenty-one".