321457 has 4 divisors (see below), whose sum is σ = 322596. Its totient is φ = 320320.

The previous prime is 321449. The next prime is 321467. The reversal of 321457 is 754123.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 41616 + 279841 = 204^2 + 529^2 .

It is a cyclic number.

It is not a de Polignac number, because 321457 - 2³ = 321449 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.

It is not an unprimeable number, because it can be changed into a prime (321427) 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, 213 + ... + 829.

It is an arithmetic number, because the mean of its divisors is an integer number (80649).

2³²¹⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

321457 is a deficient number, since it is larger than the sum of its proper divisors (1139).

321457 is an equidigital number, since it uses as much as digits as its factorization.

321457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138.

The product of its digits is 840, while the sum is 22.

The square root of 321457 is about 566.9717806029. The cubic root of 321457 is about 68.5026905012.

The spelling of 321457 in words is "three hundred twenty-one thousand, four hundred fifty-seven".