491321 has 6 divisors (see below), whose sum is σ = 518922. Its totient is φ = 465120.

The previous prime is 491299. The next prime is 491327. The reversal of 491321 is 123194.

It can be written as a sum of positive squares in only one way, i.e., 346921 + 144400 = 589^2 + 380^2 .

It is not a de Polignac number, because 491321 - 2¹⁴ = 474937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 491293 and 491302.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 491321.

It is not an unprimeable number, because it can be changed into a prime (491327) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 320 + ... + 1041.

It is an arithmetic number, because the mean of its divisors is an integer number (86487).

2⁴⁹¹³²¹ is an apocalyptic number.

It is an amenable number.

491321 is a deficient number, since it is larger than the sum of its proper divisors (27601).

491321 is a wasteful number, since it uses less digits than its factorization.

491321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399 (or 1380 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

The square root of 491321 is about 700.9429363365. The cubic root of 491321 is about 78.9081344157.

The spelling of 491321 in words is "four hundred ninety-one thousand, three hundred twenty-one".