621323 has 4 divisors (see below), whose sum is σ = 624768. Its totient is φ = 617880.

The previous prime is 621317. The next prime is 621337. The reversal of 621323 is 323126.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 323126 = 2 ⋅161563.

It is a cyclic number.

It is not a de Polignac number, because 621323 - 2⁶ = 621259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1436 + ... + 1817.

It is an arithmetic number, because the mean of its divisors is an integer number (156192).

2⁶²¹³²³ is an apocalyptic number.

621323 is a deficient number, since it is larger than the sum of its proper divisors (3445).

621323 is a wasteful number, since it uses less digits than its factorization.

621323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444.

The product of its digits is 216, while the sum is 17.

The square root of 621323 is about 788.2404455495. The cubic root of 621323 is about 85.3307986036.

Adding to 621323 its reverse (323126), we get a palindrome (944449).

The spelling of 621323 in words is "six hundred twenty-one thousand, three hundred twenty-three".