319621 has 4 divisors (see below), whose sum is σ = 322092. Its totient is φ = 317152.

The previous prime is 319607. The next prime is 319639. The reversal of 319621 is 126913.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 148225 + 171396 = 385^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 319621 - 2⁵ = 319589 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

319621 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 319592 and 319601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (319601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1030 + ... + 1303.

It is an arithmetic number, because the mean of its divisors is an integer number (80523).

2³¹⁹⁶²¹ is an apocalyptic number.

It is an amenable number.

319621 is a deficient number, since it is larger than the sum of its proper divisors (2471).

319621 is a wasteful number, since it uses less digits than its factorization.

319621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470.

The product of its digits is 324, while the sum is 22.

The square root of 319621 is about 565.3503338639. The cubic root of 319621 is about 68.3720238292.

The spelling of 319621 in words is "three hundred nineteen thousand, six hundred twenty-one".